Re: Should I diagnose or just replace rear O2 sensor? - Saab 9000 Bulletin Board - Saabnet.com
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But there is also the problem of the sensor being not bad, but too slow to be useful to the ECU.
However, let's run with the assumption that the sensor is working normally. What else could cause the catalyst monitor to not run in 16,000 miles, and also not cause any actual or pending OBD2 codes?
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