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Service Engine Soon Code P1415

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  • Service Engine Soon Code P1415

    the service engine soon light came on my car, and when I went to autozone to have it tested it threw a code P1415. I did some searching and learned that its probably just a bad air check valve (passenger side). I've also read that you can clean that valve to clear the code with some WD-40. BUT I don't know where to disconnect the hose and where to put the WD40... or if I should even do that... I was hoping that someone here could provide me with some instruction.

    Thanks in advance.
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  • #2
    no one?
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    • #3
      I haven't heard of the WD-40 thing, but you can disconnect the rubber hose that goes to the valve that's by the exhaust manifold and spray it in there. That way when you fire it up, if the valve is leaking, it'll just blow the WD-40 right into the exhaust.

      I was reading the diagnostic chart for this, and it tells you to verify that you have air pressure coming out of the rubber hoses on each side where it connects to the check valves. They tell you to use a scan tool to command the pump on, but you can just jump the relay and get the same effect. Then it wants you to start the engine and command the air pump on and watch the o2 sensors. They are supposed to drop to 220mv for about 9 seconds, then after the air pump is done it should return to normal o2 sensor values.

      So if it were me, I'd be using a scan tool to figure this out. Otherwise, toss both valves at it and call it a day lol
      91 Firebird 305 TBI

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