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How to be certain of fault code diagnosis! 700 1991

posted by  KlausC on  Sat Dec 9 21:35 CST 2017
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last visit: Fri Oct 24 10:15 CST 2014
[RELATED]

The missing speedo signal could have been from prior the repair. It does not turn on the CEL.

There are many reasons for the O2 sensor problem. If it does get replaced, the 7/8 tool from the auto parts place should work. Use some penetrating oil on the base of the sensor and let it soak. The engine can be warm, but I suggest not hot. I let mine soak for 24 hours, a couple of hours is probably good enough.

The sensor will not want to let go!! But keep after it and it should budge. If it is still hard to turn, more PBBlaster, turn to tighten, then loosen again - just a bit farther than last time. Keep doing this until it starts coming out easily.

The new O2 sensor comes with a coating of anti-seize, do not touch it. It will thread back in easily.
--
Keeping it running is better than buying new






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