Denso 234-4339 Oxygen Sensor (Air and Fuel Ratio Sensor)

Literally the oem sensor for my 2008 Saab 9-7x with the factory 5.3l V8 GM small block engine.Replaced my passenger side bank 1 sensor 1 last year, this year the check engine light came on and guess what?? My truck likes me So much, now the DRIVER side needed replacement. Yay me!I have a TECH2 scantool, the denso o2 sensors go through their ranges quickly without hanging up too long, and are consistent. I whip that truck hard and put it away wet too. Definitely recommend this o2 sensor over other brands.

The factory sensors that came out of my 2008 trailblazer ss are the exact same Denso sensors with exact part number on them. When tuning the tbss I watched these sensor perform as they should. No issues at all!

Installed in 2006 GMC Envoy 5.3Easy install. I graphed operation through TorquePro. This sensor appears to match the performance of the other oem O2 sensor (still installed).

I like it cause its new.

Great part it did the job.

Junk, failed one year and one day after purchase. I run an automotive shop and used Denso for years but the last few years the quality has declined. Denso MAF sensors and MAP sensors fail after the year warranty is over also. Buy the AC Delco, at least you have a chance of the part being the OE part originally installed on the vehicle.

So far it's working good

Good product and value, works as expected