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    CEL P0138 - Rear O2 Sensor

    Ah, thanks. I see they have an NTK for $127 after shipping, but not in stock so I'm looking for other option to get it sooner. Still not sure what the difference is between the Walker "front" and the Walker "upstream" listed on partsgeek. Different part numbers. EDIT: Advance Auto has a code...
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    CEL P0138 - Rear O2 Sensor

    "Sensor 1 is the one you are after" as an answer to the question "is the photo correct?" led to my confusion. I'll stop asking and assume that my photo is correct on both locations. The reason I asked about the connector type is that there are several O2 sensors listed for the vehicle on...
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    CEL P0138 - Rear O2 Sensor

    I know Sensor 1 is the one I'm after. How about an answer to my questions so I know I'm ordering the right part? Does Sensor 1 have pins in the connector and Sensor 2 have the blades, or is it the other way around? I also noticed Denso and Walker are the same price for the downstream sensor...
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    CEL P0138 - Rear O2 Sensor

    Does Sensor 1 have pins in the connector and Sensor 2 have the blades, or is it the other way around? I also noticed Denso and Walker are the same price for the downstream sensor. Best to go with the Denso OE? Also, I'll ask a third time, did I correctly indicate the positions of the sensors...
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    CEL P0138 - Rear O2 Sensor

    Am I correct on the position of Sensor 1 in the photo above? p2243 - O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1 So both codes seem to indicate it is a dead sensor.
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    CEL P0138 - Rear O2 Sensor

    DTCs are P0134 and P2243 Are these the positions of the two sensors?
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    CEL P0138 - Rear O2 Sensor

    How easy is it to replace an O2 sensor? I'm currently getting an error for bank 1 sensor 1 (front sensor?). I'd like to replace it myself, but not sure where it is located. I assume all I need is a wrench and ramps. M5 (2008) has been running fine, but I need it to pass DEQ for new tags. DEQ...
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