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mattmag
Premium,ExMod 2000-03
join:2000-04-09
NW Illinois
kudos:3

1 edit
reply to Anonymous_

Re: catalytic converter? P0240



99% of the time, a P0420 means you need to replace the deficient converter. O2 sensor failure *will not* cause the P0420 to set, but rather will give sensor failure codes. Monitoring the catalyst efficiency requires both the upstream and downstream sensors to be properly operating, so it is generally a very accurate failure code.

Nothing wrong with clearing it and seeing if it comes back, that's prudent.

EDIT: Dyslexia.....lol