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  • What the heck is wrong with my car?

    You are here: Home » FQA » What the heck is wrong with my car?

    I drive a 2000 Oldsmobile Intrigue and I have been trying to get it to pass emissions for almost a year. Everytime my car tests it fails and gives this reason: not ready: heated o2, o2, cat, egr, evap. I know that this is considered to be the drive cycle, and that I haven’t driven it long after having work…
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    I drive a 2000 Oldsmobile Intrigue and I have been trying to get it to pass emissions for almost a year. Everytime my car tests it fails and gives this reason: not ready: heated o2, o2, cat, egr, evap. I know that this is considered to be the drive cycle, and that I haven’t driven it long after having work done, but it seems that within hours that pesky check engine light is in again! Everytime I take it to AutoZone or Advance Auto Parts and have them put it on the OBD it gives these codes: p0446 or p0452. I have had a tune-up, changed my gas cap, and have had a new egr put one the car. Alos, per the ASE certified technician thats contracted with the emissions place I had the evaporative purge valve canister replaced today and a ciuple of hours later and the freaking check engine light is back on again!! I took it to chevy and they said that it wasn’t my canister but my ftp connector cables needed to be changed. I said ok my much are we talking they said about $380 and further said that after they changed those out they would still have to see if the module needed to be changed which would be anothe $300-$400. I don’t know what else to do…I just want my car to pass emissions so I can breathe easier and not have to worry about cops pulling me over for expired tags!! Please help and point me in the right direction!!

    Answer:
    Did you replace the evaporative canister, or the purge valve? There 2 different things. Anyway, that’s not the problem.

    The FTP (fuel tank pressure) sensor wires could be broken or the FTP could be bad and cause these codes. Especially P0452.

    P0452 = “Evaporative Emission System Pressure Sensor/Switch Low” <–Telltale right there!

    P0456 = “Evaporative Emission System Leak Detected (very small leak)” <– bogus code caused by the other problem/code. There's not really a leak. The FTP is how leaks and the purge controls are monitored. If the FTP is not reading right, it will throw bogus other codes like the P0456.

    I would go with the Chevy diagnosis, however, once there at the FTP sensor on the top of the gas tank, I could tell you if it’s the sensor or wires to it instead of guessing.

    By module I think they mean ‘fuel pump module’ which just means ‘fuel pump assembly’ which includes the FTP when you buy it from the dealer.

    Good luck, I would be going for the FTP or wires going to it.
    I would use a simple ohm/volt meter and a Scanner. Not a cheap code reader, unless it’s the type that shows FTP data. The FTP is like a 3 wire sensor.
    1. 5 volt reference
    2. Ground
    3. Signal voltage to the computer.
    Simple stuff.

    Even with a new battery, issues can arise. If the alternator is failing, that would depart you with a susceptible battery. I’ve said it oftentimes earlier than, everything else within the car are not able to come close to what the battery places out to start the auto. You might wish to have each the battery and charging process demonstrated. If which you could jump begin the vehicle and see if the charge mild stays off, that may be a just right sign particularly.

    I dont have emission test where I live, but im sure that advanced auto or autozone can delet that same code that keeps coming back.

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