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Your car is a MY99 C4? Hmm... If that is what you car is it should not have a P1123. What is your MY and model?

What did you use to get the code?

P1123 - Oxygen Sensing Adaptation Area 1 (Cylinders 1 - 3) - Lean Threshold

Which means that side is running too RICH not too lean. "Lean threshold" means the DME can not lean the mixture enough.

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Check Engine Light came on error code P1123. Says engine bank 123 is running lean. I've looked and can find no one with this code. Any help? Eric

P1123 menas tha the O2 sensor is reading Bank 1 as being RICH. I would first clean the MAF with electronics cleaner. Could also be a leaky injector or bad plugs.

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Check Engine Light came on error code P1123. Says engine bank 123 is running lean. I've looked and can find no one with this code. Any help? Eric

P1123 menas tha the O2 sensor is reading Bank 1 as being RICH. I would first clean the MAF with electronics cleaner. Could also be a leaky injector or bad plugs.

Thanks. I cleaned the MAF, I replaced the plugs 4 months or a thousand miles ago. Injectors I haven't checked.

Eric

Your car is a MY99 C4? Hmm... If that is what you car is it should not have a P1123. What is your MY and model?

What did you use to get the code?

P1123 - Oxygen Sensing Adaptation Area 1 (Cylinders 1 - 3) - Lean Threshold

Which means that side is running too RICH not too lean. "Lean threshold" means the DME can not lean the mixture enough.

Have an early 99 c4, that is 2 wheel drive. Took code with OBDII tester.
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Check Engine Light came on error code P1123. Says engine bank 123 is running lean. I've looked and can find no one with this code. Any help? Eric

P1123 menas tha the O2 sensor is reading Bank 1 as being RICH. I would first clean the MAF with electronics cleaner. Could also be a leaky injector or bad plugs.

Thanks. I cleaned the MAF, I replaced the plugs 4 months or a thousand miles ago. Injectors I haven't checked.

Eric

Your car is a MY99 C4? Hmm... If that is what you car is it should not have a P1123. What is your MY and model?

What did you use to get the code?

P1123 - Oxygen Sensing Adaptation Area 1 (Cylinders 1 - 3) - Lean Threshold

Which means that side is running too RICH not too lean. "Lean threshold" means the DME can not lean the mixture enough.

Have an early 99 c4, that is 2 wheel drive. Took code with OBDII tester.

If your car is 2 wheel drive, it is a C2. You may also just had a blip in the system. Try rebooting the computer by disconnecting the negative cable on the battery for 5 minutes. You will have to re-enter your radio code. It will also take a few drive cycles to get the idle back to normal and solid.
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Check Engine Light came on error code P1123. Says engine bank 123 is running lean. I've looked and can find no one with this code. Any help? Eric

P1123 menas tha the O2 sensor is reading Bank 1 as being RICH. I would first clean the MAF with electronics cleaner. Could also be a leaky injector or bad plugs.

Thanks. I cleaned the MAF, I replaced the plugs 4 months or a thousand miles ago. Injectors I haven't checked.

Eric

Your car is a MY99 C4? Hmm... If that is what you car is it should not have a P1123. What is your MY and model?

What did you use to get the code?

P1123 - Oxygen Sensing Adaptation Area 1 (Cylinders 1 - 3) - Lean Threshold

Which means that side is running too RICH not too lean. "Lean threshold" means the DME can not lean the mixture enough.

Have an early 99 c4, that is 2 wheel drive. Took code with OBDII tester.

If your car is 2 wheel drive, it is a C2. You may also just had a blip in the system. Try rebooting the computer by disconnecting the negative cable on the battery for 5 minutes. You will have to re-enter your radio code. It will also take a few drive cycles to get the idle back to normal and solid.

Thanks! It is listed as a C4, but I realize it's a C2 by type. I'll try rebooting. Eric

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