Switched from H box to chipped M box got this CEL
AudiWorld Super User
Joined: Dec 2004
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when I'd swapped mine over, there was an audible click, but I think that was due to the
ABS module being reactivated. Maybe you needed to pull the ECU and reseat it to clear some memory module or the act of resetting it enough cleared it?
Thread Starter
AudiWorld Member
Joined: Jan 2004
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Yeah, I could try that.
Since I'm gonna check to make sure it's fully connected anyways, might as well take it out. I might try putting my H box back in and drive for a day like that and see if I still get the O2 sensor CEL.
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