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Code 231 1995 volvo 850 850 1995

posted by  galerie on  Wed Sep 4 15:51 CST 2013
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last visit: Sat Sep 21 07:43 CST 2013
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I had code 435, 436 and 231. Had both O2 sensors replaced, now I only get code 231. Where should I look to see what is causing this code to keep coming back. I told the mechanic I had those 3 codes and he thought that the O2 sensor will fix them all.








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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

Longterm fuel trim. Usually caused by an air leak into the intake manifold, vacuum lines, air intake line from the air filter, missing a nipple on the vacuum tree, and the list goes on.


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