Denso 234-9051 Right-Bank Upstream with 4-Wire 8.5” Option Air Fuel Ratio Oxygen Sensor

Not a whole lot to say as this looks like it is a legitimate Denso (OEM supplier) sensor. Based on the part number, this should have been a direct replacement for the sensor that had gone bad in my car, and it was. It was a little difficult taking the old one out due to the very limited space in the engine bay, but the install was relatively easy. Just be very careful not to touch the probe end or to bang it on anything, and be VERY careful not to cross-thread it. I was happy that it shipped with a plastic thread protector and the threads were pre-coated with anti-seize (a good thing, because I forgot to buy some beforehand, and once I took the old one out it was a little to late to run to the auto parts store and buy it). Overall, the replacement stopped the ECU from throwing the codes and causing the CEL. It also looks to be good OEM-like quality. I've put 500-600 miles on since the replacement and haven't had any issues. Let's hope this one lasts 14 years and 110,000 miles like the first one.

Driver side upstream sensor went bad on my 07 gx470 so I managed to track down the part number and narrowed it down to this OEM part. Dealership wanted over $400 CAD for the part so there's massive savings to be had. Part came in a legit looking box and anti-seize pre applied. Car runs with no issues now so I highly recommend it!

I couldn't replace these myself, but when I took them to my mechanic he asked if they had connectors. He was pleased that he didn't have to do any wire splicing along with the chore of getting the old sensors out. Now I wasn't getting any engine codes from my old sensors, but they had over 500K miles on them so I figured it couldn't hurt to change them. Not only was I right in my assumption, I was shocked at the performance gain. I was afraid the engine was running rich, but it was actually running lean. And I didn't lose any MPG with the power gain, and it's still at the EPA rating for that vehicle. But it runs like a new truck again.

Direct OEM replacement for my 2007 Toyota Tundra. Hopefully last a long time.

Working like it is supposed to. No more check engine light!!