Frigging o2 sensor
08-20-2012, 05:44 AM
#1
Frigging o2 sensor
Ok here is the skinny... When I purchased my 1998 GT, I brought my scanner to see if the car had any engine codes, which the owner said it did have an O2 sensor code. He said he was non-mechanical, and didn't want to mess with it himself. I felt confident in replacing the sensors... So I also bought MIL eliminators because the car has a full Flowmaster system with an "H" pipe. i had a BI^CH of a time getting the rear O2 sensor out (had to pull the exhaust pipe out WD-40 the crap out of it and put it in a vise to get it to turn, because some numb nutts rounded the thing off!!!!!)... anyways... sorry about the rant. got the new sensor on, so my passenger side was reading a bad sensor in bank 1 sensor 1,2 so I paid my $50/sensor, and replaced the entire passenger side sensor bank. AND THE CODE POPPED AGAIN TODAY!!! what am I missing???
thanks, in advance...adam
sorry I am a bit frustrated.... lol
thanks, in advance...adam
sorry I am a bit frustrated.... lol
08-20-2012, 11:17 AM
#4
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Knowing the code is vital. There are many DTCs that mention one of the O² sensors in the description, however they are the result of a good sensor reporting some other problem.
Once you get the code you can look it up here to see possible causes and diagnostic tips...
Once you get the code you can look it up here to see possible causes and diagnostic tips...
08-20-2012, 09:45 PM
#6
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Did you look it up here?
"Damaged EGRVR solenoid" is #4 on the list, check #s 1, 2 and 3, and the regulator solenoid's resistance before throwing more money at the problem...
"Damaged EGRVR solenoid" is #4 on the list, check #s 1, 2 and 3, and the regulator solenoid's resistance before throwing more money at the problem...
08-21-2012, 07:00 AM
#8
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
VPWR is Voltage PoWeR, battery voltage, +12V. There is also VREF which is Voltage REFerence, a +5V reference provided by the PCM.
Here's the wiring diagram:
Check for +12V on the RD/YE wire at the EGRVR connector (KOEO, Key On Engine Off).
If that is found then check the resistance of the EGRVR solenoid coil, I.e. between the valve's two terminal with the connector unplugged--it should be 26Ω to 40Ω. If not the coil is open or shorted.
The valve is just a vacuum valve so it is unlikely it needs cleaning, nor did I see "dirty EGRVR" on the list of possible causes. I suppose that if the coil checks out you could try supplying the valve with power and blowing it out with compressed air--not too much pressure or it might be damaged. I have no idea exactly what sort of valve it is, however I'd bet that being a vacuum valve it has a diaphragm seal that could be ruptured by too much pressure or damaged by chemical cleaners.
Here's the wiring diagram:
Check for +12V on the RD/YE wire at the EGRVR connector (KOEO, Key On Engine Off).
If that is found then check the resistance of the EGRVR solenoid coil, I.e. between the valve's two terminal with the connector unplugged--it should be 26Ω to 40Ω. If not the coil is open or shorted.
The valve is just a vacuum valve so it is unlikely it needs cleaning, nor did I see "dirty EGRVR" on the list of possible causes. I suppose that if the coil checks out you could try supplying the valve with power and blowing it out with compressed air--not too much pressure or it might be damaged. I have no idea exactly what sort of valve it is, however I'd bet that being a vacuum valve it has a diaphragm seal that could be ruptured by too much pressure or damaged by chemical cleaners.