How To Diagnose & Fix An OBD2 Code P0300 - Cadillac STS

Check engine came on my 2005 Cadillac STS V-8 and gave me three codes: p0300, p0171and p0174. Took the car to the dealer and now I will fix what they told me and save over $500.

If your car has a misfire I would take a look at these few areas first and fix the least expensive things before you tackle the big ones.

If you want to do a car diagnostic you will need an OBD 2 scanner tool. The car I was working on is a Cadillac STS but I have been told the Cadillac SRX is very similar.

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