Denso 234-4623 Oxygen Sensor with 23†4-Wire Square Plug Harness

09 prius with 387,000 miles. Worked as it should. Passed maryland emissions with a new cat also. Took minutes to install o2 sensor. Had code p0420.

Good product and fast delivery.

Had a check engine light after replacing my stolen cat. Used a cheaper o2 sensor, kicked off codes forever until replaced. Swapped it with this. Still getting codes, but they are due to the replacement cat being garbage. It is doing g it's job! Probably woukd have saved the cat with the proper sensor

Denso oxygen sensor works perfectly! Fits like it should, no issues or problems. Great quality and fitment, recommend!

I needed some new oxygen sensors for my 2001 prius, and I went on a few websites to compare prices. These were the best priced, and the actual ones my manufacturer used, so it kept the car OEM. My little car was going through some engine light issues, and these seemed to help with that issue. Definitely recommend this to people who need to change these little guys, which usually last around 120K miles. These come with the liquid copper so you don't have rusting in your oxygen sensor area, which results in easy removal whenever you get around to changing them again. I bought both the upper and lower to replace and these worked really well. Made in USA too, which adds to the value. As a longtime Amazon customer, I rely on reviews from the Amazon community when making buying decisions. That being said, I only believe in giving honest and unbiased reviews.[...] Thanks for reading!

We received a used oxygen sensor with a wiring harness that was not the standard length and did not match the product description. Even after we lengthened the wiring harness and installed it, it still did not work properly.

2009 Toyota Prius 200K miles and "P0420" error code SOLUTION. After receiving a NEW DOSKJOK O2 sensor that was BAD upon arrival (Open LEAN) and many error codes later and then trying a different brand my fav mechanic told me only use DENSO. I had read this on Toyota websites and now i am SOLD. ONLY DENSO as it saved me ($700 x 2) plus a new CAT ($1000+) Even though DENSO is about $20 more than the cheapest, they are well worth every penny! 5 hours labor again at $140/hr... DENSO the First time~! My 3 Toyota's will ONLY be getting DENSO sensors and parts in the future. Thank You for a GREAT product from and Avid Researcher and DIY Guy!

After some a-hole cut the catalytic converter out of my 2007 Toyota Prius, I needed a new 02 sensor. I resisted the temptation to buy an aftermarket 02 sensor for $35 less. This Denso 02 sensor fit perfectly and is working great. Unlike the cheap Chinese 02 sensor, I have no concern that I'll have to replace it again in another few months. One callout is that the 02 sensor on a 2nd generation Prius plugs into the car's computer via a hole in the floor in the upper-left corner of the front passenger footwell. To access it, you need to remove the passenger floormat, then pull up the carpeting in the upper-left corner of the passenger footwell. I was able to do this without removing any of the plastic trim pieces (although one of the carpet retention clips on the inside broke/pulled out, but no worries). I was able to press/wedge the carpet back under the plastic trim and the carpet looks good as news and everything is as solid as before, despite the one missing carpet pin.