Recurring CEL
Thread Starter
Instructor
Joined: Jul 2015
Posts: 122
Likes: 26
From: Clermont Fl
Recurring CEL
Not really a problem but just bugs me. Every couple of weeks A CEL pops up. Print out shows bank 1 O2 sensor lean to rich. Make appointment for repair, and light goes out after couple days. Have been told bad gas, have been told driving habits, have been told low fuel. Only use top tier fuel, never go below 1/4 tank. Anyone else have this problem. I have an 18 convertible with 48k on the clock.
Melting Slicks
Joined: Oct 2009
Posts: 2,560
Likes: 485
From: Moberly, Mo
I agree with Tommy but even if it turns off by the time you get there it should still show the history of it coming on and hopefully it will give them a clue to why its coming on.
Last edited by 99vetteran; Dec 23, 2020 at 10:24 AM.
Moderator emeritus
Joined: Jun 2001
Posts: 18,599
Likes: 3,951
From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati
2015 C7 of the Year Finalist
The light might go off but there is a history code in the ECM. Sounds like you have a bad O2 sensor. Sounds like the dealer is guessing and doesn't want to put in a new sensor.
Elmer
Le Mans Master
Joined: Feb 2006
Posts: 5,979
Likes: 4,141
From: Kansas City, MO
I'd also guess the sensor is on the verge of failure. Or possibly a chafed wire to that sensor. How much gas you have in the tank has zero bearing on the car's air/fuel ratio. Even if it did, it would affect both banks.
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Race Director
Joined: Mar 2001
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From: Bonneville Salt Flats
Wonky sensor, wire, and/or connector are most likely culprits. One would think it would be saved in history, but I've seen times nothing was... for whatever reason and the dealer had to actually see the CEL in person. One reason it may be good to have ones own cheapo code-reader, to possibly (though not guaranteed) to get a better indication of what's really going on. All the best. 
Tech Contributor
Joined: Oct 1999
Posts: 41,013
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From: Charlotte, NC (formerly Endicott, NY)
Not really a problem but just bugs me. Every couple of weeks A CEL pops up. Print out shows bank 1 O2 sensor lean to rich. Make appointment for repair, and light goes out after couple days. Have been told bad gas, have been told driving habits, have been told low fuel. Only use top tier fuel, never go below 1/4 tank. Anyone else have this problem. I have an 18 convertible with 48k on the clock.
Bill
Thread Starter
Instructor
Joined: Jul 2015
Posts: 122
Likes: 26
From: Clermont Fl
I've taken it to the dealer 3 times, light was on when they did the scan, always came back left bank 02 sensor lean to rich. Dealer made an appointment for me each time but light was off by appointment time. Was given a different excuse each time, bad gas, driving habit, low fuel, etc. I'll just put up with it until it completely fails. Thanks for thbe reply's.
