Mechanics

AFTER REPLACING THE OXYGEN SENSOR, STILL MISFIRING

2003 Saturn Ion • 4 cylinder 2WD Manual • 175,000 miles

Regarding the 2003 Saturn, the oxygen sensor was replaced and the engine light came back on. Code reader still shows random misfire and now the timing is advanced to 37 degrees at 2500 rpm. What is it?
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Pfootmom
November 30, 2010.



Was there a code for the O2 sensor?