Trouble Code Diagnosis

[XanderWiFi]

After putting in my pacesetter headers, my check engine light has been on. After receiving the Ultragauge I was able to obtain those codes. I am going to look them up on my own, but if anyone knows what they are off hand, please let me know if you could.

Maybe this thread could be a source for all code diagnosis in due time.

P0130-O2 sensor circuit malfunction bank 1/sensor 1
P0136-O2 sensor circuit malfunction bank 1/sensor 2

P0443-Evaporative Emission Control System Purge Control Valve Circuit
P0449-evaporative emission control system vent valve/solenoid circuit malfunction

Here is what I found, with the information I learn from this thread, I can add it to the pacesetter thread to help people who get those headers and install them.

Not sure how to interpret the above stated codes. Obviously, it looks like I have a bad O2 sensor-but where exactly? I bought the proper extension line to connect to the moved header sensor...

The 400 codes I have no idea...

[widbyj]

Your O2 sensor is fine, just not working properly. This is a known issue with the Pacesetter headers (and others also). The sensor is located too far from the cylinders and never reaches the proper temperature to send a good signal. Replace it with a generic heated (3 or 4 wire) sensor and supply ignition on power to heat it up (can use the power feed for the rear/after-cat sensor). You can even just get another rear sensor and put it into the front location, a little wire splicing and all is good. I had to do this to mine in order to enter closed-loop operation.

I don't know if this will effect the other two codes but fix your O2 issue first so that the engine can run properly... the other codes may just go away.

[[ion] C2]

do that

[XanderWiFi]

That actually took care of it I think. I had to leave the ignition at "on" to scan and clear the codes, so they cleared, then i plugged in again and only had to 400 codes. Drove it around and the 400s were the only ones to remain.

So you just leave the ignition at "on" to juice up the sensor before starting the engine? Never thought electronics worked that way but i'll keep doing it.

Any suggestions for the other two codes?

UPDATE: for the P0499 code, a common issue is the gas cap not screwing on all the way. However, I know that is not an issue with mine as I replaced it not too long ago.

[scott192]

do you over fill your gas tank alot its known to rot the lines to the canister

[XanderWiFi]

No I fill it to the normal level. Haven't had any kind of leak or fume since I had the fuel regulator replaced.

I figure these 400 codes have something to do with being lean since I put the new headers on.

[a.graham52]

if you had access to a scan tool all you would have to do is unplug your vent valve soleniod and put a test light across the two wires and turn the valve on and off. if the test light lit... then it needs a new valve. without the ability to command the vent valve on and off idk how you would diag it.

[XanderWiFi]

I do not know where the vent valve solenoid is and I do not have a testing light to diagnose it. I do have scan tools though-through that ultra gauge which is what gave me these codes.

The little bit I have been able to find about this so far tells me that this is either an electrical issue or part replacement requirement. I don't want to put the cart in front of the horse if this is something that will be alleviated by tuning the car to the mods.

If I am reading this correctly, both 400 codes involve the EVAP system. I may be lucky and just have to replace some items beneath the old gal. Can anyone confirm?

Had the wrong 443 code it looks like...edited.

[XanderWiFi]

evac codes resulting from a bad fuse and bad cannister vacuum line. no more codes.

[Redog]

Gas cap code is P0442 ;)