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Just a quick clarification. A P1128 actually means your car is running lean and the DME trim has been adjusting mixture and reached it's max rich threshold. It still could be a bad injector but other possibilities are more likely:
P1128 (oxygen sensing adaptation area 2--cylinders 1 and 3--rich threshold)
Causes for P1128
– Incorrect signal from MAF sensor
– Intake air system leaking
– Fuel pressure too low
– Volume supply of fuel pump too low
– Fuel injectors fouled
– Exhaust system leaking
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 07-11-2012 at 06:03 PM.
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