O2 sensor (fixed lean) and restricted exhaust test (melted cat) - GM

Fixed Lean O2 (Is the sensor lying?)
The is a good review one of the testing methods I have listed in Section 5 of my eBook.
Also there is a secondary problem on this engine (a plugged cat) that I review how to identify.
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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