Denso 234-4079 Oxygen Sensor: 🚀 Superior Performance for Precise Air-Fuel Ratio Monitoring Review

Fits my '99 Ram exactly. Easy installation. Time will tell how the quality is. The price was great and the same brand as my local parts store was on sale at over 50% off.

They worked great on my '99 Jeep Grand Cherokee (WJ) with the stupid California emissions package. If you have this package, 4 sensors are required instead of 2 (Denso 234-4115, 234-4078, 234-4076 and 234-4079).

I bought 2 as they needed to match both the intake and downstream. The length is good (about 18 inches), but the upstream connector does not match the upstream connector. Even in Rock Auto it was wrong for upstream.

check engine light is on. The code indicates the front oxygen sensor heater circuit on the driver's side. I checked out Revain as usual and bought 2 of these sensors. I've decided it makes sense to change both. Reset code (PO 155). The second time the engine was started the light came on again. This was the beginning of a costly diagnosis and repair. The tech told me it was a bad oxygen sensor which I didn't believe because I had just installed these new Densos. He insisted he wanted to remove…