Re: Audi 5000 Quattro s 1987 Running rich at idle

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Posted to Technical Discussion Forum on 4/25/2007

so what is o2 sensor voltage at hot idle ?

you would expect it to be low if the ecm is commanding the system rich . so why is o2 sensor voltage low ? does the o2 sensor heater get powered up , if it doesnt the o2 sensor wont work at idle .

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