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.

Great part for a great price compared to what was wanted at my local auto parts store. I am already seeing an improvement in my MPG. It's too early to tell how much it has really impacted things but prior to putting this on I had 38 MPG and now my prius shows around 43. Overall it was fairly easy to replace. I didn't expect the wire harness is up inside the cabin of the car but a quick view on YouTube showed me how to get the job done in under 30 minutes.

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!

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.

I am not a mechanic, but this is my story. I had a check engine light (CEL) go on. Toyota said it was a P0420 'bank I catalyst system efficiency was below threshold for a predetermined period of time'. They quoted $2,263.74 to repair. The CEL went on and off for a period of months. I confirmed the code at an Autozone (which if you didn't know, checks engine light warnings for free). I found this product on Amazon and bought it with the thought that I had nothing to loose. After replacing, I drove the car for a week afterward with no light on. I am writing this review after just passing emissions! My tips for doing this are as follows: - watch a Youtube video to find the location of this sensor. (it is right under the car after the exhaust pipe begins to run horizontal) - soak the connection with penetrating oil and let sit for at least 30mins, better if exhaust is hot when applied. - remove the plug using a 7/8 wrench - pull back the carpet from the front passenger footwell beginning in the uppper left hand corner, peeling along the center console and across the back firewall until the plug connection is visualized on the side of the 'hump' in the middle of the car under the radio, still on the passenger side. - the wiring connection is in a clip retainer and slides out when pulled towards the rear of the car. Disconnect and feed wire through the floor of the car. Just push the rubber seal out that secures the wire. - install the new plug using the ring provided with the kit and apply the anti-seize compound to the threads and not in the holes in the sensor. - the seal that came with the kit did not seat in the floor like the original for me, so I cut the old one off and reused it as well as the metal wire retaining clip that was on the original. - plug into the center console connection and secure back in the retaining bracket. Replace the carpet. - drive and periodically think about what to do with the remaining money you saved! Good luck with your sensor. I hope this was thorough and helpful.

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.

Works as it should.

Prius 08 CAT was stolen after replaced this 02 sensor, i cleared the check light engine can drive for a day then the check light engine came back again!!!.

Product satisfactory.

Installer sur une celica 2003 fonctionne parfaitement

The product got here on time, but the box was broken and open. Probably it happened during the delivery. I think the price is reasonable. I have not install the product yet. Thanks