Smog fails

Tiny
DAVELEE575
  • MEMBER
  • 1991 JEEP CHEROKEE
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 227,000 MILES
Co 2.20%---- greater than 1.20%.
Also the tester say he saw smoke from tail-pipe! I did not see it!
Wednesday, March 4th, 2020 AT 12:13 PM

1 Reply

Tiny
AL514
  • MECHANIC
  • 4,131 POSTS
Hello thanks for using 2CarPros, the oxygen sensors and fuel trims need to be looked at on a live data stream. A stuck/failing oxygen sensor or a failing catalytic converter can cause higher CO readings. A stuck oxygen sensor will trick the ECM into going rich and possibly damaging the catalytic converter.
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Wednesday, March 4th, 2020 AT 12:36 PM

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