S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

will a CEL that had an o2 code stay in the ecu after it clears the light

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Old 02-27-2006, 09:02 AM
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Default will a CEL that had an o2 code stay in the ecu after it clears the light

by itself after 4 starts and stops? i'm wondering because i want to take it back to the dealer (they replaced my o2 sensor last time) but i want them to see the code
Old 02-27-2006, 09:05 AM
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Mine did. Not sure if true for all cases.
Old 02-27-2006, 10:12 AM
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My understanding is all ECU codes stay until manually cleared regardless of CEL status.
Old 02-27-2006, 10:38 AM
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werd. thanks guys
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