Review on 🔌 Denso 234-4209 Oxygen Sensor with Connectors (not included) by Justin Woolley

I replaced both lambda sensors (top and bottom) on my Pontiac Grand Prix. Unfortunately, what I didn't know was that the upstream certified carbon sensor in California had a slightly different connector. I happened to buy a regular outlet sensor, so that wasn't a problem, but I had to, er, creatively change the upstream connector. Everything was going fine, the sensor was sending a signal and life was going fine until I got a CEL for the HO2S resistor that didn't go away. I checked the resistance of the new sensor and it was within spec, but it was about half that of the original. I found it odd that the bottom Denso sensor worked well but the top didn't, so I decided to try the generic model. My guess was that the CA emission models might have different heater resistances, but "universal" versions might work. I followed the instructions in the letter (no soldering! The O2 sensor wires are finicky and it kinda messes them up) and the CEL is gone. The resistance of this generic O2 sensor was much closer to the standard it replaced, which seemed to satisfy the computer. shit everywhere. I can't figure out why the heater in the CA emissions sensor has a different resistance than any other sensor, but so far that's the only explanation for my experience.