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cel 1128 on 2000 Boxster

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I had my check engine light come on a couple weeks ago shortly after driving through a large puddle of water, I had it checked the only code was 1128, which deals with one of the o2 sensors. It went off by on it's own but came on yesterday after I went through the touchless car wash. Could this be moisture related? Any help would be greatly appreciated.

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P1128 - Oxygen Sensing Adaptation Area 2 (Cylinders 1 . 3) - Rich Threshold

This means that the oxygen sensor on that bank of the engine has sensed that the mixture is so lean that is can not correct for it (rich threshold reached).

Common causes are:

- Intake air system leaking

- Fuel pressure too low

- Volume supply of fuel pump too low

- Fuel injectors fouled

I would start looking for loose or damaged hoses or other intake leaks.

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My car has never leaked in a car wash.

I choose a carwash wand or garden hose and a sheepskin mitt over touchless, but this is due to touchless not really cleaning as opposed to a problem with leaks.

Water in the air intake should really only be a issue if the engine is running.

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  • 5 years later...

I've had the same problem for awhile, codes P1128 and P1130, and could never find what caused the codes to keep coming up. Then this weekend I changed the spark plug tubes, O rings and spark plugs. Around Tuesday or Wednesday of this week after about 100 miles of driving, the CEL went out. Any ideas what the repairs I did would have done to effect the problem causing the fault codes to go away?

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