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Discussion Starter · #1 ·
OBD2 scanner says I got code P0138 (Higher than normal voltage on the O2 sensor circuit) Air/fuel mixture rich. It says: O2 Sensor 1/2 circuit high. I wonder which of the sensors ? and how many sensors are installed. I am guessing 1 prior to the cat. and 1 after. I do not have a check engine light thou.
Any suggestions are appreciated.
 

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Probably not your situation, but on mine with long tubes no cats and the O2 sensors upstream, there was a check engine light with 6 codes (including yours) that refused to be cleared. After a year and many mechanics looking at it with various diagnosis and no fixes, it came down to a blown fuse that was overlooked (I'm no mechanic, this is all I know).
 
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