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CEL p1131 and p0303

hoger29 said:
These instructions are for a 2.5 liter engine and I believe the zetec is only a 2.0. Am I wrong in my thinking or is the O2 sensor in the same spot regardless?
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The instructions are for both. The pictures are for the 2L Zetec. The schematics are for the 2.5L Duratec.
 
So I went to by a new O2 sensor today and the CEL was off. Does this mean that the sensor isnt bad, or is this a common occurance. I plan on trying to read for code again in the morning. Any suggestions would be appreciated.
 
I havent pulled codes yet, I was wondering if anyone knows of a good way to remove some rust from a white paint on the underside of the passenger door well? the car is a 99 cavalier.
 
I changed the upstream O2 sensor on Sunday and have not pulled a CEL yet since. However in the mornings my car will stall after initial startup because the rpms fall to low. After I rev the engine a few times it pretty much disappears. I also have an idle issue with the rpms falling to low occasionally when I stop at a light or sign.
I installed new spark plugs, vacuum tested the EGR valve, cleaned the IAC, newer MAF, and checked for vacuum leak by using carb cleaner to spray around areas. I am know stuck on what else to do to remedy this idle situation.
 
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