Denso Air/Fuel Ratio Sensor - 234-9051 (Fits Select Years of Toyota: 4Runner/FJ Cruiser/Land Cruiser/Sequoia/Tacoma/Tundra and Lexus GS300/GS350/GS450h/GX470/IS250/IS350/LS460/LS600h/LX470 Vehicles)

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.

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.

Superior product

The media could not be loaded. I have to assume this is Denso's store on Amazon, since when I look at the return policy part of it says "Speak with Denso". Don't assume your product will be new and don't assume they will answer any questions. Before ordering from Amazon rather than Denso's actual website since A. Amazon noted the item could be delivered in two days. B. It is much easier and faster to return with Amazon. And I am glad I did.I made this decision after emailing Denso on all 3 of their websites with no return correspondence from them in over two weeks. Disappointed to the point I'm not even going to type it all out here. Simply put it is all in the attached video. And the one of the downstream sensors that I ordered along with both of these upstream sensors is also questionable (See my video review on Denso 234-4261). I have not even received the second downstream sensor as I was notified that it would be a day late, then notified again today it will now be 2 days late.

Had one of my catalytic converters stolen (passenger side) on my 05 Tundra 4.7 V8. The muffler shop only replaced the missing cat and the o2 sensor that was attached. I had an engine check light come on because the old Air Fuel Ratio Sensor was original and the O2 sensor was too new. Hence, the computer detected that there was a leak between the forward sensor and the o2 sensor on the same side. I decided to change the remaining 3 sensors to bring them back up to speed. Afterwards, you can feel the difference the new sensors make on a vehicle with 70,000 miles that is 10 years old. It runs quieter and with good response. After some driving, the check engine light went away with the new sensors and I could not be happier with the money I saved.To replace all four sensors, I also bought the following:ABN 3 Piece 3/8" Drive Oxygen Sensor Wrench Socket SetDenso 234-4260 Oxygen Sensor (rear sensor in cat) ( I only needed one of these.)Denso 234-9051 Air Fuel Ratio Sensor (forward sensor) (needed 2 of these)OEM plugs and thread anti-seize are included.The hardest part is removing the old sensors. Take your time and use WD40 or similar to loosen the part.

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.

It would be 5 stars but they cost alot of money. Not very easy but not that hard to install. Might have to stand on your head. Used a 13/16 box end wrench to get off the old 1. Same to install. Also if you disconnect the battery you'll have to drive alot to reset computer. Once reset it passes smog. Fun times