Re: O2 Sensors

From: Jon Smith (jon@fast4x4.net)
Date: Sun Nov 23 2003 - 17:55:27 EST

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The ECU/PCM uses data from the DS o2 sensor to determine Cat. Converter
efficiency/operation.

-Jon Smith

I understand the purpose of the front O2 sensor on a 97, 318.
But what exactly is the purpose of the O2 sensor after the Cat ?

Thanks for any info.
Jay

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