Enhance Engine Performance: NTK 23138 Oxygen Sensor for Precision Air-Fuel Ratio Control Review

Replaced the upstream oxygen sensor on my Jeep TJ, fits exactly and the wires are the perfect length. Check engine light didn't come back

Works perfectly, easy installation. Requires purchase of anti-seize add-on and 2001 Jeep Wrangler 4.0 specific connector.

Generally do not buy car parts from Amazon, that's my conclusion. I bought it for my Jeep in December. That's already a failure. Driven only 500km. The one I bought earlier came into use!

For your information. Revane says it won't fit in a 2003 Jeep Liberty. It does. Also confirmed part number and fitment on NGK website. The same number is listed on the website and here. Also, NTK is NGK. Four stars only because I couldn't give it five stars because it's an oxygen sensor! Also, stay away from Bosch oxygen sensors. they don't last. Be warned.

I used 4 Denso sensors on my Jeep and one of them failed so I replaced it with NTK. Denso is still in bank 1C1. If I compare the voltage readings, this one is more sensitive than the Denso. The voltage jumps a lot compared to Denso, it is always 0.700-0.600V, only sometimes it drops lower. NGK man is always there.