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check engine light 850

posted by  someone claiming to be tom 1995 850 turbo on  Thu Oct 5 13:02 CST 2006 [RELATED]

i went back to the volvo dealer and they pulled some additonal paperwork. the original fault code was 443 - twc efficiency, the fault code i took off the car today was 436 - rear RO2S, compensation(Rear heated oxygen sensor compensation) according to my Chilton's Volvo manual. as i said the dealer said the O2 sensors were ok. what gives??? bad gas? fuel cap? need a new catalytic converter? some odd leak in vac. system?






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