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

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 purchase was a total loss.