A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

ECU and check engine light question......

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Old Feb 10, 2002 | 06:15 PM
  #1  
AndrewM (azdaspeed3)'s Avatar
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Default ECU and check engine light question......

are engine malfunction codes stored in the ecu itself? for example, my car has a check engine light for "evap. emissions control system- small leak". if i take my ecu out and put it in another car, will that code trigger the other cars MIL too?

i dont think that this code is APR chip-related, but can anybody confirm or deny?
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Old Feb 10, 2002 | 06:19 PM
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Default I got this a few weeks ago. Cleared with vag-com, never came back.

could be gas cap.
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Old Feb 10, 2002 | 06:27 PM
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AndrewM (azdaspeed3)'s Avatar
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Default

the codes an old old issue, im not worried about it. what im worried about is if it transfers w/ ECU
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Old Feb 10, 2002 | 06:36 PM
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Default IIRC, the codes stay with the ECU. I only changed my ECU once, so I cant say from experience.

you always get the "power low on pin xxx" when you swap ECU's anyway....

Vic
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Old Feb 10, 2002 | 06:38 PM
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Default It will only trigger a DTC if the system reports a leak to the ECU. If you have no leak and put in a

different (stock or otherwise) ECU it won't have the DTC in it. Similarly, if you clear the chipped ECU's DTCs and have repaired the malfunction it won't reappear. And no it isn't a chip related DTC ..
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