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

Superior product

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.

The local Toyota dealer wanted $280. This was less than half the price. The air fuel ratio sensor arrived in two days. My 2006 Toyota Tacoma V6 had a check engine light come on. The code read P0051. My code reader said air fuel ratio sensor (Bank 2 Sensor 1) Circut low input. On the Toyota bank 2 means the driver side and sensor 1 means before the catalytic converter. Bank one is the passenger side and sensor two means after the catalytic converter respectively. My car has four sensors. I sprayed the sensor with some PB blaster to loosen it and try to take out the sensor using my 02 sensor socket but couldn’t get it removed because of the weird angle and lack of space. I went to AutoZone and they loaned me their O2 sensor kit which looks like a little C ring with an offset tab for your socket extension and I was able to get enough leverage to get it out and it came out no problem. They just charge you a deposit and refund you when you bring back the tools. Without their tools it would have been virtually impossible for me to get out the old sensor. Be sure to squeeze/press the gray tab on the old Sensor to remove it and it slides out. Be sure to use the anti-seize liquid that comes with a new sensor and squeeze it on the threads before reinstalling the new sensor. If your check engine light is still on, use the code reader to clear the codes. This fixed my problem. 100 or so miles and no more check engine light. PS. This sensor cost more than a typical oxygen sensor because it is in fuel air ratio sensor.

Worked fine for 60 days. Then failed with code saying heater circuit open. All wires look great. Nothing broken. Put old sensor back in and code went away. Put this one back and code came back.Spend the money on one that’ll last.

Awesome part! It makes my car run smoothly.

The media could not be loaded. This is a upstream sensor, goes closer to the engine/front of the vehicle. I had a engine light code come up with was also causing my bank 2 to be too lean and also causing misfires. Replaced this 02 sensor along with the affected spark plugs and fixed my issue. Will buy again when needed.

Screwed up. Be careful this is for late model 05. Will not work with early model 05. Be careful put it in did not work had to go to auto part store to get right one. My fault.

its fits perfectly and working as expected. No errors anymore. Thank you.