Question about 2000 Jeep Grand Cherokee
An exhaust leak ahead of the O2 sensor can cause this. Air leaking in gives it an inaccurate reading. Check ahead of the sensors for telltale black sooty streaks at your exhaust joints and tighten any you find loose. You can temporarily cover any small holes with some muffler tape as well. Hope this helps.
Posted on Aug 03, 2010
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Posted on Jan 02, 2017
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