P0141: Heater Circuit Malfunction (Bank 1, Sensor 2)

I've got this code twice in the last 2 weeks. How would I test the oxygen sensors or do I just replace them? Looking at the Napa website, there are 2 part numbers listed. Do I just have 2 oxygen sensors?

Yah usually there is one in the front and rear. My TJ has one under the hood and one along the cat line towards the rear. Id think the XJ was similar

Trying to figure out if I want to replace all the O2 sensors, are there 4 or 2 total?

Looks like I have 4.

Looks like the code matches the one labeled #4 in the picture. I wonder if I didn't pull a wire loose when I got under there and power washed mud out last weekend.

Here's another interesting fact: Same part number Bosch 15465
Napa $73
AutoZone $99
Checker $128

K7AZV wrote:Looks like the code matches the one labeled #4 in the picture. I wonder if I didn't pull a wire loose when I got under there and power washed mud out last weekend.

Here's another interesting fact: Same part number Bosch 15465
Napa $73
AutoZone $99
Checker $128

Check all your connections first if that is the case.

K7AZV wrote:Looks like the code matches the one labeled #4 in the picture. I wonder if I didn't pull a wire loose when I got under there and power washed mud out last weekend.

Here's another interesting fact: Same part number Bosch 15465
Napa $73
AutoZone $99
Checker $128

Wow those are expensive. If it's not just a loose connection I might have an extra sensor I can give you.