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96 STS
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After filling up my tank of gas 3 days ago my service engine soon light came on. -Check Emissons Service- that appeard on my display. I have a 96 STS. How do i run the on board diagnostics and recieve a code so i can find out the hell is wrong with my car. I also realized my gas mileage has been going down also. Does anyone kno how to do the FPR test to see if its leaking gas. Thanks
 

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1968 Cadillac Sedan deVille, 1994 Chevrolet G20
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Sounds like you'll probably find an EVAP code. With the key on, press OFF and WARMER (or if its dual zone, use the passenger side rocker's "Warmer")

With the FPR, Pull the vacuum line off of it, and see if it leaks any gas. If it even smells like gas, I might suspect it.
 
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