Bad Oxygen Sensor=Running Lean?
Thread Starter
Racer
Joined: Jun 2011
Posts: 283
Likes: 5
Bad Oxygen Sensor=Running Lean?
Hey everyone. Still trying to pass California smog. Replaced EGR Solenoid and EGR Valve. Almost passing. NOX at 15 mph still just a little bit high. Got a code P0155 heater circuit. Haven't had time to check the circuit and oxygen sensor. Did check the fuse and it was still okay. The smog tech told me that it seems like the car is running lean. Can a faulty heater circuit or oxygen sensor cause the engine to run lean?
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
Hey everyone. Still trying to pass California smog. Replaced EGR Solenoid and EGR Valve. Almost passing. NOX at 15 mph still just a little bit high. Got a code P0155 heater circuit. Haven't had time to check the circuit and oxygen sensor. Did check the fuse and it was still okay. The smog tech told me that it seems like the car is running lean. Can a faulty heater circuit or oxygen sensor cause the engine to run lean?
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
If you can get a GM sensor hit and miss with aftermarkets
GM parts direct has them for half of dealer price learned my lesson on trying to get rid of a knock sensor code using store bought stuff. $$$
Gotta buy 4 for mine next week. They get flaky after awhile
GM parts direct has them for half of dealer price learned my lesson on trying to get rid of a knock sensor code using store bought stuff. $$$
Gotta buy 4 for mine next week. They get flaky after awhile
Thread Starter
Racer
Joined: Jun 2011
Posts: 283
Likes: 5
