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Reading in the On Line FSM, it says the Downstream O2 Sensor affects the Mixture as well. From that I can gather that the Upstream ( a Wideband ) will be running the Mixture a little rich to get the Cat to Lite.. then the Downstream ( a Narrowband ) will see the mixture start going lean as the Cat Lites.. then the 'System is Checked'Just a Theory on my part, but I'll replace the Upstream Cat and see.. Note the Pre-Cat is the One with the Up and Down Stream O2 Sensors.. the main cat has no O2 Checking.. Thanks Bernie.. Cj
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