Review on 🔋 Denso 234-4800 Oxygen Sensor: Reliable Performance for Enhanced Fuel Efficiency by Clinton Delgado

I ordered this sensor and 234-4233 as a direct replacement for my 2003 Toyota Corolla LE. The car started to code P0420 due to catalytic converter problems. When the dealer flashed the ecu to TSB eg028-04 the code came back. I was about to order a new catalytic converter when I saw that another person with the same problem posted a review stating that after replacing these sensors in his car the code had disappeared. The sensors arrived a day early which was great as I needed to install them as soon as possible to pass the emissions test by the end of July. Installing the sensor was very easy. This is the sensor in front of the catalytic converter, to replace it remove the heat shield on the back of the engine, unscrew the 4 screws by 12mm, disconnect the sensor (connector 4-wire 2-black 1-white 1-blue) . Use a 22mm wrench or slotted socket to remove the sensor. Someone posted a video on YouTube showing the location of the sensors.