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12-03-2003, 03:05 PM
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#3 |
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Mizzou Tigers
Join Date: Apr 1999
Location: weston, MO United States
Posts: 1,455
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Code 91 means that your drivers side O2 sensor is reading lean. Since the right side is reading normal, that rules out a vacuum leak or a fuel pressure problem. Likely causes are a bad O2 sensor, or a bad injector in cylinders 5-8. If you don't have a miss, it's the O2 sensor. If you do have a miss, do a power balance test, and see which cylinder it is.
This is from PKRWUD, who really knows his stuff. When I had the 91, I replaced my o2 sensor and that cleared the code. Sorry, I don't know about the others. Serach the site for posts about codes.....most of these have probably been covered at one time or another.
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2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244 |
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