O2 Sensor Install – OBDII Code P0138 – NGK 23132 – Project 2004 Jeep TJ Wrangler – Howto
In this video, I change out a bad oxygen sensor (Bank 1, Sensor 2
– Downstream) but this video will be helpful if you have a code that references other sensors.
There are four O2 sensors in my 2004 Jeep Wrangler with a 4.0L six cylinder engine:
Bank 1, Sensor 1 (upstream)
Bank 1, Sensor 2 (downstream)
Bank 2, Sensor 1 (upstream)
Bank 2, Sensor 2 (downstream)
Based on my research, I recommend only using NGK/NTK sensors as these Jeeps are known to be pretty picky. I can tell you that my install solved the issue, and no more check engine light (CEL) so I feel it was money well spent not having to try a Bosch sensor to find it may or may not work. Anyway…
Here are the NGK/NTK part numbers and amazon links if you need them. These are affiliate links, so it helps me a little if you decide to buy from them… but it doesn’t cost you any more than it normally would. 🙂
These are for a 2004 (what I have) only… see below for other part numbers. BTW… these prices are much cheaper than what I paid at the local parts store… but I didn’t want to wait for shipping.
NGK/NTK #23137 – Bank 1, Sensor 1 (Upstream)
NGK/NTK #23132 – Bank 1, Sensor 2 (Downstream)
NGK/NTK #23135 – Bank 2, Sensor 1 (Upstream)
NGK/NTK #23531 – Bank 2, Sensor 2 (Downstream)
If your vehicle is different, you can always look here to find the right part numbers: https://www.ngk.com/automotive-oxygen-sensors-ngk-c904.aspx