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Discussion Starter #1
Well today as I was driving to work my CEL came back on after replacing my DPFE Sensor and the EGR Valve and I got mad.After work I took it to Autozone to have it checked and I got 2 codes. I dont remember perfectly but here it goes. Cam Shaft Position Sensor Malfunction and the second code read something like Catalytic Efficiency Bank 1. What do these mean and how do I fix the problem Please.Any help is greatly appreciated.
 

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your cam shaft position sensor may have gone bad. i replaced one in my ex's cavalier and it was only a 4 year old car, so they can go bad early. and do you have gutted precats? if so, do you have MIL eliminators? i'm no expert so hopefully someone else will ring in here.

but at least those egr codes are gone :biggrin:
 

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Bank 1, Lower o2 sensor sounds like it died. Otherwise that cat may be shot, but thats less common than an o2 sensor.
 
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