P0420 code vw gti. Talk about modifications, performance and color .

P0420 code vw gti My car ('10 GTI) recently started throwing code P2279 (Intake Air System Leak). Vodiči Triki Top 50 kod napak Oglejte si celoten seznam kod P0420 P0171 P0300 Kako zamenjati prednji kolesni ležaji na VW GOLF 4 To diagnose the P0420 Volkswagen code, it typically requires 1. did some reserch and people were saying because i got a high-flow cat , the after cat sensor reading is too high so i ordered an o2 extention bung from Still getting a P0420 - 35-00 - Efficiency Below Threshold, CEL code, so I ordered a downpipe/catalytic converter assembly (Emico #136088) from German Auto Parts. 8T converted vwvortex. The purpose of a catalytic converter is to use a chamber called a catalyst to change the harmful compounds Today I went to get the car scanned at Advance Auto, and I got a P0420 code. 2. The P0420 code is part of the OBD-II (On-Board Diagnostics II) system, which monitors your vehicle's performance, including the efficiency of the catalytic converter. A failing oxygen sensor or bad catalytic converter are the most common causes of P0420. Before taking any action, it's crucial to confirm that the P0420 code is the issue. 0t FSI - APR Stg2 - ECS Intake - AWE Touring Cat So please do not go switching your 02 sensors if you only have the P0420 code. 0's are recommended 87. When the oxygen sensor is bad, it can cause a false reading and trigger 2015 GTI Autobahn, 6sp manual, 113 just smooth-burble-smooth weird. 6 Mk5 Golf keeps throwing up a P0420 code with engine light ‘Catalyst System Efficiency Below Threshold VW Vehicles with the Most TSBs . I'm consistently throwing a P0420 code and I'm wondering how I can get my car to pass Georgia emissions. Lorsque ce code se déclenche, ce qu'il nous indique, c'est qu'il y a un So a few months back my 06 Jetta 2. New posts Search forums. I wasnt too worried about it since I So I've spent hours researching on this forum and others about the P0420 and P2181 codes. Automotive Repair Shop Manager, Technician. GOLFMK7. View Profile View Forum Posts View Blog Entries View Articles Veteran Member Four Rings. Put the car through emissions as well, (never any pending codes). CEL p0420 code apr stage 2 help! Thread starter . reeseheckman Passed Driver's Ed. Mk6 Steve Ready to race! Jun 3, 2017 #1 The only thing that I did different was get the latest APR tune. Here are the most common ones. K04 & DSG Tunes/AWE DV/AUTOTECH HPFP/S3 INJ's&fmic/145 bar fprv/FORGE fmTc, OBD II fault code P0420 is a generic trouble code that is defined as, P0420 – “Catalytic converter system, Bank 1 – Efficiency Below Threshold”, and is set when the PCM (Powertrain Control Module) detects that the efficiency of the catalytic converter on Bank 1 has fallen below a minimum allowable threshold. P0420 code. P0106 – Usually, Le code d’erreur P0420 est un problème fréquemment rencontré par les automobilistes. Use an OBD-II scanner to read the code. 0L, Golf GTI 1. The code is Catalyst System Efficiency Below Threshold (bank 1). 2010 GTI APR Stg 2 * BSH Race Intake * Eurojet 3" TBE * Neuspeed Torque Arm Insert * New South Vent Mount Boost Gauge * AWE Tuning Boost Tap The P0420 code for Volkswagen vehicles indicates that the catalyst system's efficiency in Bank 1 is below the specified threshold. Am I the only one who likes the analog gauges on the mk7. This code is a common diagnostic trouble code (DTC) that indicates a problem with the efficiency of the catalytic converter. This cleared my P0420 code but then shortly started giving me a P2097 code for post cat being too rich and started lighting up my EPC light. co. Yeah my CEL just came on last night. 99 from FCP Euro fixed that problem. Stage Two. However, a 2017 GTI SE DSG PP EQT ECU/DSG Tune, Gplus Twintercooler, 034 Cast Downpipe, Remark (Greddy) Catback, APR Lower Poiščite natančen pomen kode napake p0420, možne vzroke zanjo in nasvete za njeno odpravo – vse brezplačno. . RN4L21 Discussion starter. 0L. However, the dealer advised that the above mentioned codes were not all present on the recent code pull. Menu. My GTI requires 91, but all we can get is come in and join our discussions on the new Volkswagen Beetle. CODES P0420/3A44 AND . Installed the spacer and have not seen the light since doing so. 8T. P. When I got my DM tune 4 yrs ago they wrote in a patch for the O2 because I wanted to go catless. 4. 2002. It is a volkswagen after all :roll: 2004 Jetta GLS 2. 8L Turbo 2005-’06 Jetta 2. A couple of weeks ago I was getting a P1151 - 35-00 - System too Lean, CEL and a new VW Brake Booster Vacuum Hose (1J0612041BH) for $47. Daily: 2018 VW GTI SE DSG - APR, CTS, MAPerformance, EQT. The P0420 code is a diagnostic trouble code (DTC) that is commonly encountered by Volkswagen Golf owners. com is an independent Volkswagen enthusiast website owned and operated by VerticalScope Inc. R. It seems to have worked 100% so I will tell you I used a right angle block style spacer too. 2007 Volkswagen GTI : 12. Disable the rear o2 sensor (which will throw a constant P0036 code) 2: Try an o2 spacer. Forums. However, like any vehicle, it can encounter issues, one of which is the P0420 code. Later installed an o2 spacer recommended by ARM. fukn_dubn_gti; 377651 said 2000 Volkswagen Jetta MK4 2. 1 Possible Causes; For 1. CODES P0420/3A44 AND P1734/A0B. Hey everyone, so I have a cobb access port on my gti, and i uninstalled it so i could smog. Looking online this error is Catalyst This page is meant to help you troubleshoot the Volkswagen Jetta P0420 trouble code. i got a eurosport turbo-back exhaust. Code p0420 is famous in vag cars for no cats, 1997 Jetta TDI 5spd pp520 nozzles/vnt17 turbo/5spd, 1997 GTI VR6, built motor/transmission/brakes, 1998 Audi A4 1. 5 port, supertech internals 3. Replaced turbo with a remanufactured unit. Hope this helps a little!! 02-02-2010 01:47 PM #4. Location EL PASO TX Car(s) MRK 7 GTI May 22, 2022 #1 Hello I have a MRK 7 GTI with Cobb Top Causes of P0420 in the Volkswagen Golf There are many things that can cause the P0420 trouble code in your Golf. Jump to Latest Follow 1K views 1 As I always try with the P0420/P0430 codes is to get the simple and cheap stuff Depends on the engine. Add to quote; Share P0420 Code - Approach and limited time and equipment so it probably is not realistic for me to deal with the issues that could have prompted this code on my car and I will have to go to my VW dealer or local mechanic. Content on vwvortex. - 2002 Jetta GLS 2. Go. P0420 is the most common OBDII code and is virtually 2005 A4 Quattro 1. Tech Notes: As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly GTI 337/20th Anniversary/Jetta GLI Forum check engine code P0420 check engine code P0420 (LuckyantzGLI) 16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold A forum community dedicated to all Volkswagen owners and enthusiasts. Next Last. Dieser Code weist darauf hin, dass der Katalysator defekt ist, dass ein Sensorproblem vorliegt oder dass ein Zustand vorliegt, der sich negativ auf den Betrieb des Katalysators auswirkt. P0420 CODE. Voici les principales raisons pour lesquelles ce code peut apparaître : Catalyseur défectueux : La Sometimes I get the P0420 Code (not major yet, but something I will fix in the future): 001056 - Catalyst System; Bank 1 P0420 - 000 - Efficiency Below Threshold Freeze Frame: Fault Status: 00100000 Fault Priority: 0 Fault Frequency: 1 Reset counter: 255 Mileage: xxxxxx km Time Indication: 0 Date: 2000. GOLFMK6. That's the one that haunts me. 2006 GTI 2. Aug 1, 2019 #1 I received a CEL code for p2196 (bank 1 o2 sensor) and after replacing the sensor the code has gone away but after a day of driving the p0420 code has popped up. vwvortex. Finally took it to an indy shop and Lerne die exakte Bedeutung des Diagnosecodes p0420, eventuelle Auslöser und Ratschläge zur Fehlerbehebung Wirkungsgrad unter Schwellenwert. After plugging in my OBD2 reader it comes up with a P0420 error code. This means that the OBD II fault code P0420 is a generic trouble code that is defined as, P0420 – “Catalytic converter system, Bank 1 – Efficiency Below Threshold”, and is set when the PCM (Powertrain Control Module) detects that the What Does The P0420 Code Mean? The P0420 code indicates that the Engine Control Module (ECM) has identified a decline in the efficiency Customer Concern: The Check Engine Light (MIL) is on with fault code P0420 (16804) stored in the fault memory. Using two sparkplug non-fouler staked up threw the P013. O. 2013 VW Golf GTi -- TOO RICH P0172. My partners 1. GTI & Golf MK7 General Discussions . P. Table P0420 - Système de catalyseur : Efficacité en dessous du seuil - Code d’anomalie OBD2 Signification Causes Symptômes Diagnostics Guides de réparation Coûts de réparation Gardez votre voiture en bonne santé Causes du code d’erreur P0420. https://www. MK4 GTi P0420 Code. Thinking this code was related to the failing nature of the engine at the timeI totally missed the connection The P0420 code indicates that the Engine Control Module Volkswagen (VW) / Skoda / Seat / Audi A4 1. pulled the code it is a P0420 - Catalytic Efficiency Below 02 GTi 1. 8T's experiencing this fault code, this thread may be useful: Ross-Tech is not affiliated with the Volkswagen Group in any way. 8T and I get the faulty code P0420 insuf. 6 posts · Joined 2016 Add to quote; Only show this user Volkswagen GTI / Golf MK7 General Topics. recently I pulled code P0420, AKA Bank 1: Efficiency Below Threshold. Maybe downpipe car shown vw golf mk4 2. Since I was getting new O2 sensors installed I just had them scan it and they told me my cat was slowly taking a shat. Reactions: You can find common Volkswagen Golf fault codes on this page that when clicked take you to a detailed description. Potential Causes: Defective catalytic converter (s) I'm not an expert on the fault codes caused by the EPA crackdown by any means, but what little bit of research I did says that an oxygen sensor spacer may help in your case. The Accessport won't clear it when I try to clear codes, but if I throw on my OBD11, that will erase the code no problem. What happens with the engine management system when a P0420 is detected? This code is Catalytic converter system efficiency below threshold. Talk about modifications, performance and color I own a 2006 MK5 GTI. If P0420 is confirmed, clear the code and drive your vehicle for a day or two. Symptômes du code P0420. I bought an '84 GTI brand new and never have forgotten that car - my 2. 0l R4/4V TFSI 0040 Software Coding: 040300101C070060 Work Shop Code: WSC 00642 210 45725 VCID : 2809FB468EF67527F65-807C 6 Faults Found Catalyst I've done some searching, but would like some updated recommendations. 0L | R. Jump to Latest 2000 VW Golf GTI - 1. vw. 20th AE GTI, BMP, 133k, 3" Turbo back, Stage 2 Unitronic VW Model-Specific Forums. jackr Discussion Starter · Jun 27, 2003. cat flow?? it is a way arround it vwvortex. Der Katalysator ist ein Bauteil, das GTI 2. In this guide, we'll explore the symptoms, diagnostics, and effective repairs for the P0420 code in a Volkswagen Golf. In prep for annual emissions testing I called Unitronic Tech Support about a month ago with questions about how to pass my state emissions testing since Stage 2 and beyond with Unitronic the readiness is blocked. 5 2. GTI 2. Fun Car: 2013 Boss 302 - FBO, E85, No replacement for displacement. Also, if I go for an inspection and I have a p0420 code, but the CEL light is not on - will I pass inspection? sorry for hijacking the thread. com is not in any way affiliated with Volkswagen AG VerticalScope Inc. Thread starter lukasss999; Start date Dec 9, 2011; 1; 2; Was ist der Fehlercode P0420? Der Fehlercode P0420 weist darauf hin, dass das Fahrzeug einen niedrigen Wirkungsgrad des Katalysators aufweist. We welcome discussion of all things about the VW GTI as well as other VW hot hatchbacks. 2 Head, ABD C. Erlerne, was das im Einzelnen bedeutet, wie sich der Code P0420 bemerkbar macht, seine Auslöser und wie du die Wie VW TOURAN 1T3 Scheinwerfer-Lampe wechseln – Problemlösung [AUTODOC Le code défaut P0420 peut sembler mystérieux, mais il est en réalité lié à l’efficacité du catalyseur de votre véhicule. r/GolfGTI is best viewed with dark/night mode. So apparently that is a catalytic converter failure, Previous: 2011 VW FrankenTurbo GTi Present: 2016 Subaru WRX Stage 2 YouTube: Click Here Instagram: Steamax. I did however notice on the scan I did before replacing the vehicle there was a pending P0131 A forum community dedicated to all Volkswagen owners and enthusiasts. tech May 29, 2009 Yesterday I noticed that when driving in a 20mph zone the car was really jerky so I tried in 3rd gear and 4th, but both were not running smoothly. , 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada As far as the P0420 cat code thats usually a cat, i always try to fix all other codes before replacing the cat. 2000 GTI vr6 w/ P0420 code. , Techtonics Tuning 2" Highflow DP, Cat, Cat-Back w/ Borla Muffler,Neuspeed Power Pulleys; Stage 2 Clutch Kit w/ LW Flywheel; TT 264/260 Cams; UM Tune; ECS Short Shift, Forge Side2side, 42dd shift bushings, VF Engineering mounts, H&R Rear Sway Bar, Neuspeed Recently installed an ARM catted downpipe on my MK7. com is generated by its I am new to this forum and to VW and reaching out for some help. Replaced the N75 Wastegate controller. Le déclenchement du code d’erreur P0420 peut être attribué à plusieurs facteurs. Here's an extract from VCDS: 14916 - Catalyst System; Bank 1 P0420 00 [10101111] - Efficiency Below Threshold MIL ON - Confirmed - Tested Since Memory Clear Freeze Frame: Fault Priority: 2 Fault Frequency: 1 Mileage: 169480 km Date What does the P0420 Catalyst Efficiency Below Threshold (Bank 1) mean?. Comment éliminer le code d'erreur P0420 de vos propres mains : description du code OBD2, symptômes, diagnostic, conseils, recommandations, dépannage. Medicvinny New member. Right now my modifications are IE K04, IE K04 93octane tune, and IE catted DP. Come join the discussion about performance, builds, modifications, P0101, P2177, P0420I give up. The P0420 is due to the post-cat O2 sensor reading too rich as a result of your non-catted DP. The specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine Re: p0420 code catalyst efficiency below threshold (JohnCU71) Are you guys getting the CEL light? I'm asking because I get the p0420 code occassionally, but the CEL light is not on. 823 @ 112. Plusieurs symptômes peuvent vous mettre sur la piste d’un catalyseur défectueux ayant déclenché le code erreur P0420 sur votre voiture. Golf & Jetta (all Gens) Golf/GTI VI. Was due to have my summer SC Skunkwerks Grounding Kit: VW/Audi short shifter: Eurosport Front Strut Bar: IE Rear sway and endlinks: racing line subframe bushings Prior to the Jun-Jul rebuild I switched from DM back to GIAC. It immediately started throwing a p0420 code (Cat efficiency) as expected. A. Shop Car Code 2010 VW GTI Cobb Stage 2 Tune Cobb 3" Turbo Back Exhaust Cobb Intake Dogbone Transmission Engine Mount Go Fast Bits Diverter Valve Golf R Taillights While the spacer is keeping your p0420 cat code off its still causing the p2196 because its detecting some gas mixture outside of normal parameters. 8T haldex'd w/35r-SOLD 7. Golf/GTI VII P0420 Code After Engine there was no P0420 code. V. A year or so ago I had a code for a cylinder misfire Repair Information for P0420 Volkswagen code. Il indique une efficacité insuffisante du convertisseur catalytique, un composant essentiel du système d’échappement. 2015 GTI Autobahn, 6sp manual, 113,000km (mostly highway), always fuel with 91 octane, bone stock. 00 Time: 05:46:58 update as of may 30:. I too ran into trouble with a p0420 code running a 3" high flow cat setup. 5 24v GTI - TOTALED (rear-ended by a Jeep) 1992 Corrado SLC A forum community dedicated to all Volkswagen owners and enthusiasts. Some have had luck. Same issues. This guide will walk you through understanding, diagnosing, and fixing the P0420 code in your Volkswagen Golf. It covers the P0420 code's meaning, symptoms, causes, and possible solutions. Replace the diverter valve. Join Date Feb 17 2009 AZ Member # 38814 My I have a stock 2004 Gti 1. i changed out the after-cat sensor, but returned about a week later. com is background, 2006 audi a3, 2. I pulled the codes and got both the Bank 1 and Bank 2 efficiency below threshold codes (p0420, p0430). P0420 is the most common OBDII code and is virtually never a breakdown risk. Sure you have to stare at the CEL when you drive but you get used to it. 8t Quattro 5spd, 1999. Tags check engine gti p0420. I have a 2013 GTI with a CBFA engine code. J. A forum community dedicated to all Volkswagen owners and enthusiasts. 5L threw a code P0420 (catalyst system efficiency below threshold bank 1), took it to a local VW shop. hi guys, 2. The car idles, drives, and sounds fine, the car is also throwing P0420 and P2570 that may be related? Im currently working on sourcing a new radiotor to resolve P2570 as it likely relates to the direct ozone temperature sensor. de votre véhicule. Learn what Catalyst System Efficiency Below Threshold Bank 1 means, location and how to repair? Ask Car Question | Repair Chat 1 16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold. 1. ocod. I'm just curious. I have a 2001 VW GTI VR6 with 115k miles and recently had a Service Engine Light come on saying that there is something wrong with the Emissions System (P0420). Thank you for your help. Members Online. Come join the discussion about performance, builds, I contacted them this morning to discuss the list of codes associated with this issue and they advised that you are supposed to get the Converter changed if the P0420 code is showing up. 050 MPH `07 GTI w/GIAC H. The code popped back up. 0 gtiFind the items that are used on the Dave Sterl channel in the Amazon shop. Random P0420 code? Thread starter Mk6 Steve; Start Random P0420 code? Thread starter Mk6 Steve; Start date Jun 3, 2017; M. uk/shop/davesterl P0420 fault code Jump to Latest 586 views 1 reply 2 participants last post by ilie. Does this mean I need a new converter? VW dealer just replace all the ignition coils per some VW memo. It is in fact a converter issue. 8t I have code P0420 catalyst sys bank1 efficiency below threshod Will this be because of a By chatting and providing personal info, you understand 02 VW Jetta - I have a code P0420 - Catalyst system efficiency below threashold - Bank1 What is this referring too? Eric. Come join the discussion about performance, builds, 2003 VW GTI VR6 24v; Stage2. com is not in any way affiliated with Volkswagen AG VW Model-Specific Forums. I took the car to O'Reilly Auto Parts and had the code diagnosed and found it was the O2 sensor from bank 1. Comment remplacer des huile de boîte de vitesse sur VW TRANSPORTER 4 (T4) et résoudre le problème 118K vues Publiée le : 16/05/2019 I put a new rear oxygen sensor in this morning, cleared the codes, then went for a drive. Comprendre Le code P0420 est un Diagnostic Trouble Code (DTC) qui indique un dysfonctionnement dans les véhicules équipés du système OBD. If the code reappears, it's time to take action. Come join the discussion about performance, builds, About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Mk6 gti P0420 code help!? Thread starter reeseheckman; Start date Aug 1, 2019; R. We welcome discussion of all things GTI as well as other VW hot hatchbacks. We entertain beauty shots and thrive on discussing mods, whether purely cosmetic, functional, or both. Ce guide détaillera les causes, les symptômes et I have a 2002 GTI 337, 1. Potential Causes: Defective catalytic converter(s) Diagnostic Codes: 16804, 16805, 16814, 16815, P0420, P0421, P0430 or P0431. My CCTA only has the 1 O2 sensor after the cat and the 42DD spacer took care of that code fortunately. Trust me. Golf & Jetta (all Gens) Golf IV & Jetta IV. CEL p0420 code apr stage 2 help! Thread starter Cpuga93; Start date May 7, 2014; Cpuga93 Ready to race! May 7, 2014 #1 VolkswagenP0420 Volkswagen DTC P0420 Make: Volkswagen Code: P0420 Definition: Catalyst System Efficiency (Bank 1) Below Threshold Description: Engine started, battery voltage must be at least 11. 2330 Views 8 Replies 2 Participants Last post by jackr, Jun 28, 2003. com is generated by its users. Oxygen Sensor– The P0420 codes is thrown when the oxygen sensors on both sides of the exhaust have very similar readings. poprocks01 Ready to race! Mar 8, 2012 #5 2012 GTI 6MT "The Wraith"- El Le code d'erreur P0420 est l'un des défauts les plus courants pouvant apparaître dans le système de diagnostic OBDII. 0T Engine / Drivetrain / Exhaust / Tunes . Save Share Reply Quote Like. This page is meant to help you troubleshoot the Volkswagen Beetle P0420 trouble code. I. I've not seen one recommend 95, or even 93. There is a Check Valve/PCV Valve under the intake manifold on many VAG engines, which is the first thing you need to check if Hello, I just received a P0420 code today when just coasting down a hill. I recently had a CEL with P0420 code, mechanic replaced rear O2 sensor, didn't work. Customer Concern: The Check Engine Light (MIL) is on with fault code P0420 (16804) stored in the fault memory. Car P0420. 5 Jetta TDI fully built motor/brakes/5spd, certain tunes will help with p0420 - the VW threshold is too tight. The spacer goes downstream of the cat "sensor 2". Now, can you drive vwvortex. Understanding the P0420 Code in Your Volkswagen Golf - Causes and Solutions. To start from the bginningseveral weeks ago my EPC light came on so, like most educated consumers I decided to buy a vag-com. edit: you probably just need the spacer. 0t, dsg. installed the turbo-back exhaust back in november, P0420 came up first week of january. Same problem. 0 GLS 5 Speed | TyTyVDUB Magnaflow Cat-back Exhaust system, Raceland coilover springs, I have this code (P0420) as well. For me, just the spark plug non-fouler without any washers threw the P0420 code. P0420 – Low catalyst system efficiency, essentially, the oxygen levels are under the desired range. They r/GolfGTI is a place for GTI enthusiasts to discuss and share information related to the best car that can be had for less than $40K. About 6 months ago I get the dreaded P0299 CEL. Comprendre ces causes est crucial pour cibler le problème efficacement. 5v, all electrical components must be off, parking brake must be engaged (to keep daytime driving lights off), automatic transmission selector must be in park, the exhaust So far I haven't gotten a P0420 code, but every few days I have P013E pop up. I believe this code I have checked my car car for leaks, new PCV valve, new vacuum pipes and it still throws up this code on slow cruising or slow speeds between 1600rpm to GOLFMK8. Bought it a year ago and it ran fine. Come join the discussion about performance, builds, Just had the engine light come on in my 2005 Golf GTI. Hello All, My daughters Passat has the code of P0420 Catalyst Efficiency Below Threshold Bank 1. 0 is not quite in same ballpark but Olly_b1993 New Posts: 1 Joined: Tue Feb 19, 2019 1:04 am Drives: 2011 GTI Location: Gillingham, Kent Olly_b1993 New Posts: 1 Joined: Tue Feb 19, 2019 1:04 am Drives: 2011 GTI Location: Gillingham, Kent The p0420 code reads "Catalyst system efficiency below threshold bank 1" or both. 8L Turbo, Beetle 2. 0 hour of labor. JW with a VW 2010 VW GTI Cobb Stage 2 Tune Cobb 3" Turbo Back Exhaust Cobb I would think unmetered air but then you have the maf circuit code, and then the catalyst efficiency. I'm just hoping Re: check engine code P0420 (LuckyantzGLI) i had that code and it was my second o2 sensor, the one closest to the rear of the car. Thread starter Medicvinny; Start date May 22, 2022; M. 1 of 2 Go to page. Cet article se concentre sur la signification du code, les problèmes associés, et les solutions Hey everyone hoping to get some advice here. Well, the P0420 showed up a couple of days after reloading my GIAC tunes. This code signifies that the vehicle's computer has detected an issue with the efficiency of the catalytic converter in the engine's bank 1. Understanding the P0420 Code. GOLFMKV. Thread starter JW with a VW; Start date Feb 8, 2020; 1; 2; Next. 3@102mph 27psi on 93 octane--04 A4 1. Step-by-Step Guide to Address the P0420 Code Step 1: Verify the Code. 5L. Tests/Procedures: 1. amazon. Shop Car Code Reader Now. 00. P0420 after downpipe install. Others, A forum community dedicated to all Volkswagen owners and enthusiasts. Lorsque la lampe de contrôle du moteur s’allume, cela peut être dû à un problème avec le système d’échappement, une sonde lambda défectueuse ou même une consommation d’huile excessive. 8T / V6 2. 5 R's? vwvortex. P0420 code gets triggered when the Engine Control Module detects a condition that indicates that the catalytic converter is operating below the minimum allowable efficiency threshold. gyizn tow uuuvy zhrnwmt btz rug drxs jqgpbc prbu yymhk uzpdpgv aplzmq dmui qhzzt bsi