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12-17-2001, 03:04 AM
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Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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I know I already answered this, but here goes: For your car, a KOER code 91 has only one definition: Your left O2 sensor is telling the ECM that your running lean. This can be caused by many things, but since you're not getting a code 41, that means it's either a problem with cylinders 5-8 or the O2 sensor itself.
Take care, -Chris
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