RE: OBD Code 420 for catylatic converter

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RE: OBD Code 420 for catylatic converter

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RE: OBD Code 420 for catylatic converter - 3/11/2008 10:21:37 AM

dsm1990gsx

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quote:

ORIGINAL: asim281

quote:

ORIGINAL: dsm1990gsx

p0420- is cataylitic converter below threshold, which means you need a new cataylitic coverter.

I don't think it means I need a new Cataylitic converter right off the bat. There are many reasons as to why this code can appear. Catalyst efficiency low-bank 1 is the meaning off P0420. The oxygen sensors monitor the cataylytic converters ability to store oxygen. Probable causes:
1. Engine misfire or running condition
2. Large vacuum leak
3. Engine oil leakage into exhaust-valve guide seals

Trust me as long as your o2 sensors are switchig you need a cat.

#1 and #3 will cause a cat to go bad and #2 will not give you a p0420 or p0430. You get either o2 codes or bank 1/2 lean codes.

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2003 Ford Escape old ladys car
1990 Tsi Awd daily driver
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(in reply to asim281)