Kwiksen Heated 2-Piece Air Fuel Ratio O2 Oxygen Sensor Set 1 & Set 2 (Upstream and Downstream) - 234-9041 & 234-4149 Review

Very disappointed with the product purchased! It was a straight fit which I made easy to install. My car was still giving the same code and I had to take it to a professional for a diagnosis. The bottom sensor was working properly, but the top sensor was malfunctioning. Extra money wasted! I will never buy this product again!

Was fitted to an 05 Scion TC. After correctly resetting the CEL gauge/code, the P0031 code still comes up on startup. I've replaced both O2 sensors (since this kit comes with both) and the mass air flow sensor (I thought it messed up the readings from the first O2 sensor) and replaced the new air filter and the code is still there on the first start (no driving) . Maybe the first (before the cat) O2 sensor is defective

Bought a set of sensors 02 upstream and downstream. And the descending one turned out to be defective. I ended up buying an exactly fitting Bosch from the auto parts store (for $120) which worked great to pass the test. You get what you pay for in this case. Half price = half quality. Since I bought the kit I need to figure out how to send the failed floor sensor back or just vacuum it up. Update August 12 (9 months after purchase). The upper sensor failed after less than 5,000 km. This…

Hi guys I got these oxygen sensors for my 2006 Scion Tc at Revain on 8th July 2019 and 10th July 2019 after getting them I went through the old ones these new ones were very easy to install replacing the ones i ended up installing. I drove my car on the freeway when I went to Walmart to buy some stuff and I drive my car back on the freeway the next day. Check engine, my problem was solved, I saved a lot of money, each oxygen sensor was between $150 and $200 at O'Reilly's Autozone or auto parts.

so I just installed both replacement parts on 19th July 2020. My originals had 291,000 miles on my 2005 tC. (yes, this is the original seal and NTK from the factory). I couldn't tell any difference compared to OEMs. I installed and definitely saw my fuel capacity increase. The idle seems smoother. I've ridden about 502 miles since installing it, mostly for a trip to the beach and a short drive back. I didn't give 5 stars because I didn't want to be hasty and claim perfection. A bang for the…