Mark Carter
You are right to query the upstream sensor, at present I feel the post cat sensor is just reporting the facts.
You may well have a AFR sensor up-stream with a default voltage of 3.3 volts, switching either side for a rich / lean reading.
Check all the basics including air leaks up stream of the cat.
Mark
Modern cars, Its all wizardry and witchcraft
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Mazda MX5 1.8 2011 - Code P2097 post cat rich # - david evason April 4, 2013, 9:54 pm
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on April 4, 2013, 10:09 pm, in reply to "