OBD II question
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This is a discussion on OBD II question within the Mid-Atlantic States forums, part of the Regional Discussion category; This is probably a stupid noob question, but i wanna make sure I understand how the OBDII system works. They ...

  1. #1
    Registered User yelWRXlow1's Avatar
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    OBD II question

    This is probably a stupid noob question, but i wanna make sure I understand how the OBDII system works. They are now using OBDII in my area to check emissions or whatever. So if i get up/downpipes with the CEL fix, then i will be good to go come inspections time right? The fixes will make the computer think that everything is kosher right? I just need a definate answer, because i have heard mixed answers. Thanks
    <---------------------I dont have the sonic WRX anymore....decided it was time for an upgrade!

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    Registered User silversti's Avatar
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    Yes, you should be fine. Don't know where you are located, but in PA there is also a visual you will need to pass. Just a catted downpipe will work.
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    Registered User yelWRXlow1's Avatar
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    i am in jersey, and last time i went through the inspection line, they didnt visually inspect my exhaust system. they dont even have a lift in the state inspection center.
    <---------------------I dont have the sonic WRX anymore....decided it was time for an upgrade!

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    Registered User Jack's Avatar
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    Doesnt the CEL fix just get rid of the Check engine light in ur cabin? but the cel is always there?

    But the accessport can trick the obd because its already hacvked into the ecu and told it has all the cats?
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    Registered User yelWRXlow1's Avatar
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    Heh, you got me, thats why im asking! hahaha. I would like to have a definate answer on this though.
    <---------------------I dont have the sonic WRX anymore....decided it was time for an upgrade!

  7. #6
    Banned dark_rex's Avatar
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    depends on what CEL fix you have.

    the $65 "simulator" fixes (like perrin) actually trick the ECU into thinking everything is okay.

    the typical $20 fixes will eliminate the CEL, but will leave the I/O monitor on "not ready." so even though you don't show a CEL, the ECU is monitoring the sensor b/c it thinks there may be a potential problem. (technically, there is! instead of recieving varaible signals from the sensor, the resistor is just sending one constant voltage. the ECU is expecting to see a stream of values)

    these fixes are largely cosmetic, and only save you the trouble of not knowing what CEL is tripped. the simulator will also be enough to trick the OBDII emissions check. it doesn't make you invincible though. a visual could still fail you if they are suspicious.

    HTH.

    dR

  8. #7
    Registered User platano's Avatar
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    Originally posted by Jack
    Doesnt the CEL fix just get rid of the Check engine light in ur cabin? but the cel is always there?

    But the accessport can trick the obd because its already hacvked into the ecu and told it has all the cats?
    I don't think so dude. the only reason the CEL goes out is because the resistor provides the signal that the good sensor would give anyway. If it was JUST for the CEL to go out, then the CEL would not come on for anything.
    However, (incase I misunderstood what you were trying to say). For some cars, the ECU will store (log) the last few error conditions found by the ECU, even though the condition no longer exists. But you can get rid of these by reseting the ECU, and running the car for a couple of weeks after reset.
    State of CT required that the ECU has been running for a few weeks (2-3weeks I can't remember). they can read that info off the header info in the ECU (ie. they can tell how long ago it was reset), if it was reset a few days before the inspection, they have failed people over it.
    Then again, CT emissions testing right now is a mess because of the new system, but that's a whole other subject

    So to answer the original question, you should be good to go. If the thing ever showed a CEL, I'd reset the ECU, run the car and wait a few weeks before going over to Emissions.
    Quote Originally Posted by zoophagy
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    Registered User platano's Avatar
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    Originally posted by dark_rex

    the typical $20 fixes will eliminate the CEL, but will leave the I/M monitor on "not ready." so even though you don't show a CEL, the ECU is monitoring the sensor b/c it thinks there may be a potential problem. (technically, there is! instead of recieving varaible signals from the sensor, the resistor is just sending one constant voltage. the ECU is expecting to see a stream of values)

    these fixes are largely cosmetic, and only save you the trouble of not knowing what CEL is tripped. the simulator will also be enough to trick the OBDII emissions check. it doesn't make you invincible though. a visual could still fail you if they are suspicious.

    HTH.

    dR

    I stand corrected
    Quote Originally Posted by zoophagy
    Happy Birthday. May all your birthday dreams come true except for the one were I come over to your house, and you timidly ask me if I have ever kissed another guy before, and it ends up some weird poo porn movie.

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    What about the mechanical fix? Cost about 5 bucks, and no wiring necessary. From what I have read on other forums, no CEL, and the O2 sensor will read "ready" in the I/O monitor on the OBDII screen after a couple of weeks (after reseting the ecu).

  11. #10
    Registered User Jack's Avatar
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    Originally posted by coyote73176
    What about the mechanical fix? Cost about 5 bucks, and no wiring necessary. From what I have read on other forums, no CEL, and the O2 sensor will read "ready" in the I/O monitor on the OBDII screen after a couple of weeks (after reseting the ecu).
    I was always under the impression that these cel fixs were only for cosmatic purposes and for the ablity to know when you have a "real CEL", like overheating..or leaking oil or something.

    Maybe Dark Rex will chime in again
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  12. #11
    Banned dark_rex's Avatar
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    Originally posted by coyote73176
    What about the mechanical fix? Cost about 5 bucks, and no wiring necessary. From what I have read on other forums, no CEL, and the O2 sensor will read "ready" in the I/O monitor on the OBDII screen after a couple of weeks (after reseting the ecu).
    mechanical fix? like on the godspeed DP? i think you'll pass no problem with that.

    Originally posted by Jack
    I was always under the impression that these cel fixs were only for cosmatic purposes and for the ablity to know when you have a "real CEL", like overheating..or leaking oil or something.

    Maybe Dark Rex will chime in again
    " I am Jack's flashing Check Engine Light."

    you are correct about the the $20 fixes (like ponyexpress) it's largley cosmetic. but i would argue there is some benefit to knowing you don't have 5 other codes tripped, and just assuming "oh, it's just my downpipe CEL, nothing to worry about" meanwhile, you're misfiring on 3 cyls, running lean, and damaging the car.

    The $70 fixes are essentially the same thing, only instead of sending one value all the time, it actually uses power from the battery to "simulate" real variation. the only benefit is that the ECU stops monitoring the sensor closely, and you can pass emissions.

    dR

  13. #12
    Registered User yelWRXlow1's Avatar
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    Okay so what is the bottom line thing i can do to have an up/downpipe (without cats) and still pass inspection on the obdII system? I want to avoid having to swap parts for inspection.
    <---------------------I dont have the sonic WRX anymore....decided it was time for an upgrade!

  14. #13
    Registered User Jack's Avatar
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    Originally posted by yelWRXlow1
    Okay so what is the bottom line thing i can do to have an up/downpipe (without cats) and still pass inspection on the obdII system? I want to avoid having to swap parts for inspection.
    ACCESSPORT!
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    Banned dark_rex's Avatar
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    Originally posted by yelWRXlow1
    Okay so what is the bottom line thing i can do to have an up/downpipe (without cats) and still pass inspection on the obdII system? I want to avoid having to swap parts for inspection.
    Perrin Simulator!

  16. #15
    Registered User yelWRXlow1's Avatar
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    Okay so the Perrin Simulator is a sure thing?
    <---------------------I dont have the sonic WRX anymore....decided it was time for an upgrade!

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