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OBD codes 1123 1125

Jeremy Cottrell
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Loren Member

Loren

Posted
  • Admin
Posted

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

P1125 - Oxygen Sensing Adaptation Area 1 (Cylinders 4 - 6) - Lean Threshold

Fuel/air mixture is so rich that sensing is up to its lean threshold. Which means you are running too rich.

The manual lists probable causes as:

- Fuel pressure too high.

- Fuel injector leaking.

- EVAP canister purge valve open.

  • 4 years later...
aracerx Member

aracerx

Posted
Posted

Has anyone had any luck getting rid of these 2 codes. It's a 99 Boxster 5-speed with a new oil seperator. Any ideas? Thanks

what was the outcome of this problem, we have the same exact code problem-thanks Mark

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