Stuntsy Normous
NAXJA Forum User
- Location
- North Carolina
There's plenty of info online about how to replace O2 sensors, but this post is to address some specific questions that I didn't find answers to anywhere during my search (at least not accurate answers anyway):
1) Which O2 sensor(s) do I need?
2) How to get rid of a CEL after replacing?
Before we get started, here's a little background that probably sounds familiar. Recently had an intermittent CEL. Took my non-California compliant, 2001 XJ Sport into Autozone to have a courtesy OBD II Scan. Returned PO138, which is typical of downstream (after the catalytic converter) oxygen sensor failure.
First, wasn't able to find which sensor I needed. There are only two on the non-Cali XJ. Decided I'd just replace both at the same time, but all the parts vendors have at least eight to choose from...(maybe because the California compliant Jeeps have 6 sensors?) Autozone didn't know which ones either. Anyway, had to resort to getting under the Jeep looking at the OEM (had to rub away the rust with some WD40 and steel wool). Identified: Upstream (Before Cat) NTK 56044214AA, Downstream (After Cat) NTK 56041213AG.
Next I found a cross-reference to the BOSCH and NGK parts. Upstream: NGK 23151, and BOSCH 13100. Downstream: NGK 23099, and BOSCH 13138. Correspond roughly to "Front-Upstream", and "Rear-Downstream" in the descriptions on Autozone, and NAPA. (Question #1 answered)
Bought the BOSCH version parts from Autozone, and also got a loaner O2 Sensor socket (7/8") for 3/8" drive ratchet, which was helpful. With some WD40 and some torque, got both sensors installed.
Afterward, I drove around the rest of the afternoon, about 50 miles, a few trips. The CEL still didn't go out. Found numerous solutions online, like unhook the battery, take it back to Autozone/Mechanic to have it reset, but I wanted it reset ASAP. So I just reset the ODO to zero, turned off the Jeep, and then held in the trip reset button and turned key to on position. The dash gauges/lights went through the self-diagnostic routine, and when it was finished, the CEL was gone. I started it up to confirm, and it was still good. (Question #2 answered).
I know this is pretty elementary to most of you, but I was a little shocked I couldn't find these answers online earlier, so I hope it helps someone out there. :eeks1:
1) Which O2 sensor(s) do I need?
2) How to get rid of a CEL after replacing?
Before we get started, here's a little background that probably sounds familiar. Recently had an intermittent CEL. Took my non-California compliant, 2001 XJ Sport into Autozone to have a courtesy OBD II Scan. Returned PO138, which is typical of downstream (after the catalytic converter) oxygen sensor failure.
First, wasn't able to find which sensor I needed. There are only two on the non-Cali XJ. Decided I'd just replace both at the same time, but all the parts vendors have at least eight to choose from...(maybe because the California compliant Jeeps have 6 sensors?) Autozone didn't know which ones either. Anyway, had to resort to getting under the Jeep looking at the OEM (had to rub away the rust with some WD40 and steel wool). Identified: Upstream (Before Cat) NTK 56044214AA, Downstream (After Cat) NTK 56041213AG.
Next I found a cross-reference to the BOSCH and NGK parts. Upstream: NGK 23151, and BOSCH 13100. Downstream: NGK 23099, and BOSCH 13138. Correspond roughly to "Front-Upstream", and "Rear-Downstream" in the descriptions on Autozone, and NAPA. (Question #1 answered)
Bought the BOSCH version parts from Autozone, and also got a loaner O2 Sensor socket (7/8") for 3/8" drive ratchet, which was helpful. With some WD40 and some torque, got both sensors installed.
Afterward, I drove around the rest of the afternoon, about 50 miles, a few trips. The CEL still didn't go out. Found numerous solutions online, like unhook the battery, take it back to Autozone/Mechanic to have it reset, but I wanted it reset ASAP. So I just reset the ODO to zero, turned off the Jeep, and then held in the trip reset button and turned key to on position. The dash gauges/lights went through the self-diagnostic routine, and when it was finished, the CEL was gone. I started it up to confirm, and it was still good. (Question #2 answered).
I know this is pretty elementary to most of you, but I was a little shocked I couldn't find these answers online earlier, so I hope it helps someone out there. :eeks1:
