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Fix check engine light code po420 grand - A3 Audi Cars & Trucks

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

chiquititas
  • 1010 Answers

SOURCE: CTS CODE PO420

most of the time its the sensor that cause this,id try replacing the sensor on it,that usually fixes that code,but you have to get the code cleared off with a scanner ,and then re-scan it to make sure it doesn't come up again,good luck with it.

Posted on Jul 02, 2008

ewashmidas
  • 362 Answers

SOURCE: I got code PO420 and PO430

Here are the most common problems,

Air leaks at the exhaust manifold or in the exhaust pipes. Catalytic converter is damaged, contaminated or has failed. Front HO2S or rear HO2S is contaminated with fuel or moisture. Front HO2S and/or the rear HO2S is loose in the mounting hole. Front HO2S older (aged) than the rear HO2S (HO2S is lazy)

Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with one of the components or sensors it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and you need to diagnosed and repaired it. Autozone turning the light off does nothing for you, and is against their company policy. If you do not have the proper tool, reference materials or experience I would take it to a professional. Finding out the trouble code is just he start of the diagnosis process.

Hope this helps.

Dave

Posted on Feb 28, 2009

polarcycle
  • 1392 Answers

SOURCE: PO420" Catalyst efficiency low Bank 1"

Replace the catalytic converter.

Posted on Mar 10, 2009

c17hydro
  • 2984 Answers

SOURCE: 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

Posted on Mar 29, 2009

  • 1 Answer

SOURCE: 2000 Mazda Miata, check engine light comes on. Code PO420

I HAVE A 2000 MAZDA MIATA AND IT IS BRINGING UP A CODE PO421, CAN YOU TELL ME WHAT THAT IS

Posted on Jun 08, 2009

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


P0420 is catalyst system efficiency below threshold (bank 1)

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1 Answer

CTS CODE PO420


most of the time its the sensor that cause this,id try replacing the sensor on it,that usually fixes that code,but you have to get the code cleared off with a scanner ,and then re-scan it to make sure it doesn't come up again,good luck with it.

Jun 29, 2008 | 2005 Cadillac CTS

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