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How to correct check engine code

Tiny
CHRIS SIMMONS
  • MEMBER
  • 2005 JEEP GRAND CHEROKEE LAREDO
  • 135,000 MILES
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!
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Monday, November 14th, 2011 AT 8:58 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Sounds likeyou may have alike a coolant leak cooling the converter down have it checked for that.
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Monday, November 14th, 2011 AT 9:27 PM
Tiny
CHRIS SIMMONS
  • MEMBER
  • 2 POSTS
There is no apparent leak. A leak large enough to cool the cat would have to be pretty big wouldn't it?
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Monday, November 14th, 2011 AT 9:30 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Using a live scanner, check the O2 sensors output to see if they are within spec.
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Monday, November 14th, 2011 AT 11:43 PM

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