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P0418 code

This is a discussion on P0418 code within the Firebird / WS6 forums, part of the Vehicle Specific category; The P0418 code is driving me crazy. All secondary air systems seem to be fine but it keeps setting this ...

  1. #1
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    P0418 code

    The P0418 code is driving me crazy. All secondary air systems seem to be fine but it keeps setting this code.
    - Air pump output fine
    - fuse and relay fine(of course, the pump works)
    - solenoid works and has vacuum
    - actuating valve opening with vacuum
    - 2 check valves into engine working (feel vacuum when on)
    Thats all of the equipment and its working so why the code. Does anyone have a copy of the 2002 repair manual for code P0418. I would like to look at that. I ahve the 1998 but its a different system.

  2. #2
    Yeah baby! Yeah! silverWS6's Avatar
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    Silver 2002 WS.6
    Red 1989 Formula

    Just get a mail-order tune and cancel the system out, useless anyways and just causes headaches IMO :duuno:

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    What is a good brand, link , and is there any danger of screwing up the car?

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    Yeah baby! Yeah! silverWS6's Avatar
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    Silver 2002 WS.6
    Red 1989 Formula

    Quote Originally Posted by johnfin View Post
    What is a good brand, link , and is there any danger of screwing up the car?
    Frost is very good at it, and no danger is screwing up the car. It'll actually help it, do you have any other mods on it?

    Here is the link: TunedByFrost.com - Professional Tuning For Your LSx Powered Car or Truck

  5. #5
    Member sjgreen6's Avatar
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    Navy Blue
    2002 Trans Am WS6 Conv

    PM sent. I have the three service manual pages in .pdf, just need an e-mail address to send them to.

  6. #6
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    '02 WS.6 / '07 Suburban

    I would suspect that the check valves are bad and are allowing exhaust to back up into the system. Pull the hoses and start the car - see if there is a noticeable difference from right to left in sound and if exhaust gases are being expelled from the check valves.

  7. #7
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    codes

    I pulled the air hose and felt the input to the exhaust on startup, there was a vacuum which seems good. I need to check both valves because one could be bad. Now p0418 seems to have disappeared and p0430 and p1416 have tripped. I have opened up a can of worms.

  8. #8
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    '02 WS.6 / '07 Suburban

    Running the car with the hoses pulled may have tripped more codes. That could be the reason for the passenger side secondary air code and catalyst efficiency. Clear the codes and I bet you are simply back to your original issue.

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