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Sorry to say, but this is waste of time without knowing the actual code.
It can be as easy as replacing fuel cap to vacuum leak, CPS, etc...
I've replaced all 4 O2 sensors (2 post, 2pre) bought from Amazon for $200.
When O2 sensor goes bad, it will shoot out very specific CEL code to indicate which one to replace.
If you are planning to DIY, make sure to have O2 socket tool.
As for vacuum leak, your best friend will be the smoke tester. Without that it's just guessing game.
Last edited by white46; 12-19-2014 at 02:34 PM.
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