Weirdest o2 sensor problem!
10-04-2014, 10:29 PM
#1
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Weirdest o2 sensor problem! I am at a loss of words and ideas.
I have had my check engine light come on 5 times for the same o2 sensor. The code states that I have "low voltage with Bank 1, sensor 2." I replaced both the problem sensor and the passenger sensor as well because I was told that I needed to replace them in pairs. The light continued to come back on so I replaced the sensors again with new ones. I still have a check engine light and I have no clue why.
Vehicle: 2001 trans am WS6....41k original miles
Thanks for reading!
I have had my check engine light come on 5 times for the same o2 sensor. The code states that I have "low voltage with Bank 1, sensor 2." I replaced both the problem sensor and the passenger sensor as well because I was told that I needed to replace them in pairs. The light continued to come back on so I replaced the sensors again with new ones. I still have a check engine light and I have no clue why.
Vehicle: 2001 trans am WS6....41k original miles
Thanks for reading!
10-05-2014, 10:02 AM
#2
To see if you got a bad one, swap side to side as well. That's the quickest way to eliminate the sensor itself if the other side isn't complaining.
Which sensors did you replace? If your car has stock-ish exhaust(cats) you likely have 4 sensors. Bank 1 sensor 2 might be the /aft/ O2 sensor which would measure cat function.
Beyond that, you may have a wiring issue. Check continuity from the PCM to the O2 sensor plug I think. Should be able to search around here and find out what pins on the PCM harness go to that O2 sensor.
Which sensors did you replace? If your car has stock-ish exhaust(cats) you likely have 4 sensors. Bank 1 sensor 2 might be the /aft/ O2 sensor which would measure cat function.
Beyond that, you may have a wiring issue. Check continuity from the PCM to the O2 sensor plug I think. Should be able to search around here and find out what pins on the PCM harness go to that O2 sensor.
10-05-2014, 11:55 AM
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To see if you got a bad one, swap side to side as well. That's the quickest way to eliminate the sensor itself if the other side isn't complaining.
Which sensors did you replace? If your car has stock-ish exhaust(cats) you likely have 4 sensors. Bank 1 sensor 2 might be the /aft/ O2 sensor which would measure cat function.
Beyond that, you may have a wiring issue. Check continuity from the PCM to the O2 sensor plug I think. Should be able to search around here and find out what pins on the PCM harness go to that O2 sensor.
Which sensors did you replace? If your car has stock-ish exhaust(cats) you likely have 4 sensors. Bank 1 sensor 2 might be the /aft/ O2 sensor which would measure cat function.
Beyond that, you may have a wiring issue. Check continuity from the PCM to the O2 sensor plug I think. Should be able to search around here and find out what pins on the PCM harness go to that O2 sensor.
10-05-2014, 12:26 PM
#4
You haven't been burned by a bad replacement part yet I see. I mean it's worth swapping side to side to make sure a new sensor is not bad. It isn't common but it happens and has happened to me.
Did you clear the codes from the computer after changing them? Did you change all FOUR oxygen sensors?
By continuity, I mean checking to make sure the wire is connected all the way through. Simplest way is to use a multimeter(even the $5 Harbor Feight deal will do this) and check resistance(ohms) from one end to the other. If you have very close to zero, the wire is probably good. A shop could do this for you pretty easily and quickly as well.
Did you clear the codes from the computer after changing them? Did you change all FOUR oxygen sensors?
By continuity, I mean checking to make sure the wire is connected all the way through. Simplest way is to use a multimeter(even the $5 Harbor Feight deal will do this) and check resistance(ohms) from one end to the other. If you have very close to zero, the wire is probably good. A shop could do this for you pretty easily and quickly as well.
10-05-2014, 04:06 PM
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You haven't been burned by a bad replacement part yet I see. I mean it's worth swapping side to side to make sure a new sensor is not bad. It isn't common but it happens and has happened to me.
Did you clear the codes from the computer after changing them? Did you change all FOUR oxygen sensors?
By continuity, I mean checking to make sure the wire is connected all the way through. Simplest way is to use a multimeter(even the $5 Harbor Feight deal will do this) and check resistance(ohms) from one end to the other. If you have very close to zero, the wire is probably good. A shop could do this for you pretty easily and quickly as well.
Did you clear the codes from the computer after changing them? Did you change all FOUR oxygen sensors?
By continuity, I mean checking to make sure the wire is connected all the way through. Simplest way is to use a multimeter(even the $5 Harbor Feight deal will do this) and check resistance(ohms) from one end to the other. If you have very close to zero, the wire is probably good. A shop could do this for you pretty easily and quickly as well.