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How to be certain of fault code diagnosis! 700 1991

posted by  Rattlebone54 on  Thu Dec 7 22:19 CST 2017
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Hello To Everyone
My 740 Base showed fault codes 2-3-2 and 3-1-1. Never have O2 sensor replaced, had new speedometer reinstalled 15k ago. Cleaned entire fuel system, throttle valve 4k ago. Reason for cleaning was idle went from sewing machine smooth to a slight roughness, 2mpg reduction also. This car has had so many new part replacements that it was sooooo smooth running...So check engine light comes on and gives me these codes (double-checked and zeroed).
I am leaning towards replacing the O2 sensor as a start and never did this job, but my local parts place will rent me a socket to do so..
Anybody experience this malady before? What can I soak on the sensor threads on CAT to help loosen the sensor? Any tips I could beg off of anyone? Thank you so much! Rattlebone






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