How to correct check engine code

2005 JEEP GRAND CHEROKEE LAREDO
135,000 MILES
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CHRIS SIMMONS
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Initial code indicated replace bank 1 rear O2 sensor. When replaced, new code indicated problem with cat converter and same O2 sensor. I was advised that there was a TSB about incorrect error codes and I then had computer "reflashed" at Jeep dealer. Jeep dealer then advised error codes indicated problem with cat plus replace 4 O2 sensors (must be Mopar!!) Meineke replaced cat with "strong" aftermarket unit plus 4 Mopar O2 sensors. Error code now indicates "cat deficiency". Feels like I am going in circles!!
Nov 14, 2011 at 8:58 PM
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HMAC300
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sounds likeyou may have alike a coolant leak cooling the converter down have it checked for that.
Nov 14, 2011 at 9:27 PM
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CHRIS SIMMONS
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There is no apparent leak. A leak large enough to cool the cat would have to be pretty big wouldn't it??
Nov 14, 2011 at 9:30 PM
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JACOBANDNICKOLAS
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Using a live scanner, check the O2 sensors output to see if they are within spec.
Nov 14, 2011 at 11:43 PM
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