Review on 🚀 Enhance Performance and Fuel Efficiency with Kwiksen Air Fuel Ratio 234-9023 Oxygen Sensor Upstream Left Sensor 1 Bank 1 Replacement by Patrick Johnson

I've never heard of these A/F sensors so I decided to give it a try. They are mostly less than $50 versus $130. It's cheap for an upstream air-fuel ratio sensor. This item was for a 2003 Toyota Rav4, Left (Driver Side) Top AF Sensor. They appear to be well made. The length of the cable is correct, as is the end of the socket. All cables are color coded like the original cables. They had a protected plastic sleeve on the threaded end and silver anti-seize material on the threads. I removed this grease and used a copper lube for higher temperatures. The code on the car is gone and the bull sensor readiness test passed. Time will tell if they will last as long as the originals or at least be a good OEM replacement. Will monitor and update this review if prematurely paused. To update; August 27, 2021 Failed. Code P1135. I will switch to Denso. In general, the year went very well. Came out very easily. It's only $40 today, so I still recommend them.