Review on Denso 234 4189 Oxygen Sensor by Steve Waldbillig

I gave 4 stars. All I know is that my check engine light has stopped working. The sensor itself is easy to install, but on my truck [a 2003 Toyota Tacoma] it's difficult to remove the old rusty nuts on the old sensor due to years of exposure to the elements under the truck at the tailpipe. My understanding is that this is a stock sensor. In my case I had to remove the passenger seat as the sensor runs into the cockpit from the outside of the car and the connector is under the passenger seat carpet. But I don't mind taking precautions. I've seen this exact sensor listed elsewhere for three times the price. I'm sure I saved a lot of money in labor costs by doing it myself. It was a different number sensor than the one I removed, but both were Denso. They may not make the old sensor anymore, but bottom line, it works.