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CAT error code 4-4-3 850 1995

posted by  KlausC on  Wed Sep 21 19:32 CST 2016
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last visit: Fri Oct 24 10:15 CST 2014
[RELATED]

I drove it today, a 50 mile highway trip, not a problem. At least no code pending. My daughter explained that the code came on at the same place both times, on the freeway in stop and go traffic.

I checked the fuel pressure, 36psi with a warm engine. Just about where it should be. I could always add a bottle or two of injector cleaner.

I agree, it probably needs both O2 sensors. I just hate to shell out a bunch of money on an educated guess. No codes for the front or rear O2 sensor. The front O2 sensor has a bunch of dried oil on it, which means it has been in the car for quite a while. The rear O2 sensor appears to be original.

I guess I will have to fix that before I sell it...

My only 'test' is to let daughter drive it to work?

--
Keeping it running is better than buying new






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