Po420 twc system low bank 1 code - 1999 GMC Yukon

Question 1

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1answer

Dodge caravan 07 3.3L V6 have trouble code P0420

Generally speaking the catalytic converter is worn out and the system reads this and sets the code P0420

Nov 01, 2012 • Dodge Cars & Trucks

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What does a ******** Catalyst(TWC) system, low efficency service code mean? and where is it located

Exhaust Converter on Bank #1 side, is worn out,needs
to be replaced

PO420 &PO430 are Converters Below Efficiency

Should have lasted another year or two

I suspect you don't keep up on what the car
required,air filter,spark plugs,O2 Sensors & the like.

Your fuel trim & ignition issues over the years ruined it

Jun 02, 2012 • 2001 Cadillac Seville

4helpful

3answers

Diagnostic trouble codes dtc po420 po102

CODE PO102 IS MAF SENSOR CIRCUIT LOW FREQUENCY CONDITIONS / CODE PO420 IS CATALYST SYSTEM LOW EFFICIENCY BANK 1 CONDITIONS. BAD MASS AIR FLOW SENSOR WILL AFFECT CONTAMINATE DAMAGE CATALYTIC CONVERTER DUE TO RICH EXHAUST EMISSIONS.

Jan 26, 2011 • 1997 GMC Jimmy

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1answer

1997 mercury sable po 420 bank 1 which sensor do i change.

That could be the cataylic convetor you could try the oxygen sensor behind the cat the last one to the rear of the vehicle bank 1 sensor # 3 but P0420 is TWC system witch means low efficiency in the cat but it could be a sympthom of an other problem but if the code is 0420 thats where i would start

Nov 17, 2010 • Mercury Sable Cars & Trucks

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2answers

P0420 code on my 2003 chevy s10

please go to the provide link for diagnosis of this code,but the bottom line here is the catalytic converter may be worn out

http://www.p0420.com/

Aug 06, 2010 • 2003 Chevrolet S-10

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1answer

What is this code po420 bank 1 in a che?vy monte

I could go on and on about Po420 code but it's easyer to tell you to go to www.po420.com and everything you want to know and then some is there. Let me know if this was helpfull..4 thumbs up !

Feb 24, 2010 • 2002 Chevrolet Monte Carlo

4helpful

2answers

1998 grand am 2.4 liter, engine code po420 (twc system low efficiencty bank 1) what does this code mean

Catalyst System Efficiency Below Threshold Bank 1
this is code P0420.
It's telling you converter is not as efficient as it should be.You can drive it like this forever,or spend to replace a converter.

Dec 06, 2009 • 1998 Pontiac Grand Am

3helpful

3answers

1998 saturn check engine lite comes on gives codepo420&po573

Code po573 is cruise control / brake switch circuit A circuit voltage high PO420 catalyst system below threshold, po573 is probably a bad brake circuit / switch problem, PO420 is a bad catalatic convertor for bank 1

Sep 28, 2009 • 1998 Saturn SC

13helpful

1answer

1997 toyota camry check engine light on,code po440,po420,po441,

P0420 is catalyst system efficiency below threshold (bank 1)

P0440 is evaporative emission control system malfunction

P0441 is evaporative emission control system incorrect purge flow

Mar 29, 2009 • 1997 Toyota Camry

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1answer

PO420" Catalyst efficiency low Bank 1"

Replace the catalytic converter.

Mar 09, 2009 • 1999 Acura TL

Question 2

Anonymous

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Vehicle needs a Primary or first position Oxygen sensor, bank one just means it's the O2 sensor before catalytic converter

Answer 2

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Posted on Dec 23, 2009

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I have 1998 gmc pick up truck and has code po 420

Answer 3 · 12/6/2009 12:00:00 AM

Anonymous

1608 Answers
Posted on Dec 06, 2009

SOURCE: 1998 grand am 2.4 liter, engine code po420 (twc

What this means is that the three way catalytic converter is not doing it`s job and it needs to be replaced.First check the exhaust system and make sure it is not bent or has holes.If it`s good then make sure the rear o2 sensor is working properly.If that`s good the you will have to replace the cat.converter.Good luck.

Testimonial: "that was an amazingly fast...I'm going to have my brother check that out this week...thank you so very much. "

Answer 4 · 12/6/2009 12:00:00 AM

Anonymous

1608 Answers
Posted on Dec 06, 2009

SOURCE: 1998 grand am 2.4 liter, engine code po420 (twc

What this means is that the three way catalytic converter is not doing it`s job and it needs to be replaced.First check the exhaust system and make sure it is not bent or has holes.If it`s good then make sure the rear o2 sensor is working properly.If that`s good the you will have to replace the cat.converter.Good luck.

Testimonial: "that was an amazingly fast...I'm going to have my brother check that out this week...thank you so very much. "

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Po420 twc system low bank 1 code - 1999 GMC Yukon

2 Answers

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Related Questions:

Dodge caravan 07 3.3L V6 have trouble code P0420

What does a ******** Catalyst(TWC) system, low efficency service code mean? and where is it located

Diagnostic trouble codes dtc po420 po102

1997 mercury sable po 420 bank 1 which sensor do i change.

P0420 code on my 2003 chevy s10

What is this code po420 bank 1 in a che?vy monte

1998 grand am 2.4 liter, engine code po420 (twc system low efficiencty bank 1) what does this code mean

1998 saturn check engine lite comes on gives codepo420&po573

1997 toyota camry check engine light on,code po440,po420,po441,

PO420" Catalyst efficiency low Bank 1"

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1999 Yukon

Dodge caravan 07 3.3L V6 have trouble code P0420

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Po420 twc system low bank 1 code - 1999 GMC Yukon

2 Answers

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Anonymous

Add Your Answer

Attachments: Added items

Related Questions:

Dodge caravan 07 3.3L V6 have trouble code P0420

What does a ******** Catalyst(TWC) system, low efficency service code mean? and where is it located

Diagnostic trouble codes dtc po420 po102

1997 mercury sable po 420 bank 1 which sensor do i change.

P0420 code on my 2003 chevy s10

What is this code po420 bank 1 in a che?vy monte

1998 grand am 2.4 liter, engine code po420 (twc system low efficiencty bank 1) what does this code mean

1998 saturn check engine lite comes on gives codepo420&po573

1997 toyota camry check engine light on,code po440,po420,po441,

PO420" Catalyst efficiency low Bank 1"

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1999 Yukon

Dodge caravan 07 3.3L V6 have trouble code P0420

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