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International Automotive Technicians Network
Re: Downstream O2 diagnosis
Posted to Technical Theory Forum on 1/14/2007 3 Replies

Hi Bob

Are you familiar with the 1991 Geo Prizm (and its Toyota progenitor)? It was equipped with a "sub-O2" sensor. What was the purpose of said sensor?

Believe it or not, the sub-O2 sensor caused more driveability headaches in terms of diagnosis than any... Login to read more.

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