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Car Misfiring. Front or Rear O2 Sensor. Wich one most likely be at fault? 900

posted by  volvito on  Thu Dec 4 13:15 CST 2008
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last visit: Sun Mar 23 04:59 CST 2014
[RELATED]

I have a 1996 960 with an inconsistent problem. Sometimes I get P0172 system too rich. Other times P0301 misfire cylinder one. I do have a tiny misfire I can notice in the exhaust. I Changed the MAF sensor. No vacuum leaks. Fuel Pressure OK, but to make sure all system is working I also have a new Fuel Pressure Regulator. My only other option, even OBD codes never show anything, is the O2 sensors, but out of the two front and rear, I don't know which one would be the most likely to give trouble. Any opinions? Thanks






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