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4-3-5 fault code question 850 1995

posted by  someone claiming to be Jim Trombetti on  Fri Nov 24 14:14 CST 2000 [RELATED]

I have a 4-3-5 "heated oxygen sensor response slow" fault on my 95 n/a 850. I assume that the O2 sensor is headed south but having some experience with Zirconium O2 sensor in industrial applications, a slow response indicates a) ambient O2 entry plugged or b)Zirconium ceramic shell around sensor clogged or plugged up with carbon or goo.

Any brickboard readers have similar fault? New O2 sensor $200+ and with Christmas coming up my budget is strained as it is.

I replaced the timimg belt about 1k miles ago, no misalignment or tooth error. With it being an interferance engine, I think the valves would have complained if the belt was installed in error.





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