SOURCE: ford taurus 2002 diagnostic says
Hello! the P1506 is indicating a defective Idle Air Control (IAC) valve,,,P0191 is indicating a fuel rail pressure sensor (FRPS) fault...I suspect a cause and effect on the two codes...
Cause= IAC...Effect= FRPS....See photo below...Remove and clean with throttle body spray cleaner before you purchase a new one...It may only be blocked with carbon...Guru..Saailer
ACDELCO Part # 2171810 Cost $70
I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867
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