Threads Tagged with p0420

2001, 2002, 2005, 42, 99, a6, audi, c5, cat, code, foulers, p0420, trick, tricks, tt

A6 4.2 with P0420, anyone tried the plug fouler trick?

d6lc on 11-29-2012

01-18-2013 07:45 AM
by Philhawtin

9

4,015

16516, audi, code, control, dtc, failure, obd, p0140, p0159, p0420, p0507, p1509, p1602, trouble, unit

Work in progress...AUDI DIAGNOSTIC TROUBLE CODE (DTC) OVERVIEW.

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Colonel Bogey on 10-18-2000

12-04-2012 02:08 PM
by zsolt1

19

20,037

18t, 42, a4, a6, audi, bad, cat, code, emission, induction, p0420, p0422, p0423, pump, sai

Failed SAI Pump (P1411&P1423) Causing P0423 Cat Code?

prehayem on 10-02-2012

10-22-2012 04:32 AM
by rohit13

5

2,872

2.7T V6 Discussion

0420, 16804, 18t, 2001, 42, a3, a4, a6, a8l, audi, code, codes, common, fault, p0420, po420, q5

p0420 fault code on 2006 Audi A3

liern on 07-01-2012

07-01-2012 07:55 AM
by liern

0

5,535

Audi A3 / S3 / RS 3

1999, 2001, 27t, 28, 99, a4, a6, audi, b8, code, denali, gmc, p0420, po420, vag, yukon

P0420 CAT OR 02 sensor? 2.8l FWD

rohit13 on 12-21-2011

12-23-2011 11:08 AM
by rohit13

9

6,557

a4, audi, bad, clear, code, fix, o2, p0150, p0420, seafoam, sensor, symptoms, volkswagen

Need help diagnosing emission codes...

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GTA_Driver on 10-19-2011

10-20-2011 07:00 AM
by GTA_Driver

11

2,232

18t, 2003, 2004, a4, a6, audi, b6, code, codes, engine, p0299, p0420, po299, po420, tts

Help with engine codes P0299 and P0420

mongs on 02-01-2010

07-14-2011 01:06 PM
by mongs

4

17,756

18t, 2001, a4, a6, audi, b5, cat, causing, code, forum, leak, p0420, po420, replaced, returns, tt, vag

Replaced Cat - P0420 returns. Now What?

mwspera on 04-26-2009

03-02-2011 02:57 AM
by infamous107

7

6,540

002, 16804, 2002, a4, a6, audi, catalyst, code, coding, faul, fault, mil, p0420, s4, system

Fault code 16804, help.

viktor88 on 11-04-2010

11-07-2010 04:13 PM
by Dana @ Ross-Tech

3

7,011

17539, 18t, a4, audi, bad, bank, cat, code, fault, o2, p0420, rear, spacer, threshold, trouble

Some weird fault codes.. Bank 2 o2 on a 2002 1.8T? Quantity Adjuster? N320 valve..?

reject902 on 07-25-2010

07-29-2010 11:17 AM
by Pete@ECSTuning

4

4,021

A8 / S8 (D3 Platform) Discussion

001, 16814, 17979, 17983, 2004, a8, audi, audiworld, engine, mounting, p0420, p0430, p1575, tt, valve

CEL on with bunch of new faults

BongoCruiser on 03-22-2010

03-23-2010 11:53 AM
by MP4.2+6.0

2

4,265

1996, 2000, 2004, a4, a6, audi, chevy, code, p0420, po420, procedure, testing, throwing, truck, vag, vr6

PLEASE HELP - Turning on code P0420

sbrimlow on 02-12-2010

02-15-2010 04:12 PM
by Dana @ Ross-Tech

1

2,803

16683, 2001, 2003, a4, audi, boost, control, d2, p0299, p0420, pressure, range, reached, regulation, vag

P0299 Boost pressure regulation and P0420 Catalyst System

mongs on 02-01-2010

02-02-2010 05:36 AM
by Uwe@Ross-Tech.com

3

10,975

01, 2001, 2003, a4, a6, audi, b5, cat, code, forum, o2, p0420, po420, s8, sensor

P0420 Cat or what

Mrider on 06-21-2009

08-20-2009 08:28 AM
by JWhalen123

3

6,105

1999, 42, 99, audi, b1, bank1, cat, diagnose, efficiency, mazda, mazdap0420, miata, p0420, suburban, threshold

P0420 Bank 1 Efficiency Below Threshold

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win_r6_02 on 11-24-2008

07-30-2009 02:30 PM
by Imola a4

18

34,754

001056, 002, 20, 20tfsi, a4, audi, b6, blown, cat, o2, p0420, p0420002, sensor, tfsi, tirar

BLOWN MY CAT????AUDI A4 B7 2.0TFSI

edwardsline on 02-18-2009

03-14-2009 12:24 AM
by initialA4

2

2,473

2000, a6, audi, codes, engine, p0420, p0430

I never get any fvcking breaks. Ever. Audi is telling me my car is throwing hard faults

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audikillsbmw on 10-13-2008

10-13-2008 06:27 PM
by BernieBenz

16

2,249

P0420/P0422...

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momotoTTe on 09-20-2008

09-20-2008 03:58 PM
by MCPaudiTT - DEFCON 1

13

2,791

02, 16804, a4, audi, audiworld, cel, front, o2, oxygen, p0420, replacement, sensor

CEL reveals code P0420/16804. just swap out front O2 sensor?

heateris on 09-14-2008

09-14-2008 10:53 AM
by heateris

0

1,916

quick question.I have a p0420 code and all the readiness have pass, can i pass inspections?

believeryes on 07-01-2008

07-01-2008 08:00 AM
by believeryes

2

938

NY / NJ / CT Discussion

01, 16487, 16500, 20, 3510, cabrio, code, cylinder, intermittent, misfire, multiple, p0103, p0420, p0442, rosstech, vw

02 VW Cabrio 2.0L codes...

Shaun on 03-26-2008

03-27-2008 05:27 AM
by Shaun

2

1,816

A4 (B5 Platform) Discussion

01310, 156a, 16804, 3500, 4b0, 4z7, 887, 919, 927, allroad, audi, b, catalyst, control, level, module, p0420, system

Does anyone have an experience with these codes? If so, what was the solution.

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Tattoo on 02-21-2008

02-22-2008 02:22 AM
by Audiot

11

8,664

Audi allroad

06, 20t, a4, aeb, audi, code, dts, lifestyle, long, p0420, po420, price, ride, safe, trip, v35, vagcom

What can be wrong if I get P0420 Engine Check Code - Catalyst efficiency low bank 1

kgrig on 02-17-2008

02-17-2008 08:04 PM
by Audi_kraut

6

13,368

2001, 20100663, 28, 28quattro, a6, audi, catalytic, converter, p0420, p0430, programming, quattro, system, tsb, update

2001 2.8 30v tip: shop won't install my magnaflow or aftermkt cats, help plz [pics]

loustylez on 12-18-2007

12-18-2007 10:53 AM
by Carson@RiversideAudi

9

1,345

A4 (B5 Platform) Discussion

P0420 Popped up after I broke 100k...

Pablohippie on 08-02-2007

08-03-2007 09:57 AM
by Tgr_Clw

7

1,729

043, 20, 2002, 820, 8n0, 8n1, 920, 980, cylinder, jetta, mercedes, misfire, no, p0420, part, r350

DTC codes i'm trying to hunt down and fix. i'd love ideas on how!

phiberoptik26k on 07-11-2007

07-12-2007 04:51 PM
by phiberoptik26k

7

1,753

CEL - P0420 - Bank 1 - lacking from search...

bcart82 on 06-17-2007

06-17-2007 05:52 PM
by bcart82

7

3,094