Denso 234-4622 Downstream Oxygen Sensor with 12” Harness and 4-Terminal Square Connector

Fit my 2012 rav4 perfectly. Much cheaper than parts store

I got the P0420 trouble code on my 2009 Rav4, and my mechanic replaced it with an off-brand O2 sensor. However, I got the error again, and he convinced me to replace the catalytic converter, which didn't solve the trouble code..... I purchased this Denso O2 sensor and installed it myself, and it solved the problem for 4 years! I am experiencing the error again after 50,000+ km and am purchasing this sensor again for another 4 years. DON'T CHEAP OUT ON SENSORS, THE CAR WILL HAVE PROBLEMS.......lesson learned!

Llegó basta rápido a pesar que venía de USA. Después de investigar bastante en foros , y ver la página de Denso, este es la pieza necesaria para eliminar el molesto 'Check Engine' de mi Toyota Avalon '99. No utilicen los sensores genéricos de refaccionarias, no sirven para estos carros son muy sensibles a los sensores, el 234-4622 era idéntico al original que le quite. Cabe recalcar, que mi Toyota es de emisiones Federales (no California) , así que tienen que estar seguros cuál pedir. Me funcionó para B1S1 y B2S1

My car is a 2009 Toyota RAV4 with a 2.5L 4-cylinder engine. I believe this Oxygen Sensor is a piece of Original Manufactured equipment (product #234-4622) because it fits perfectly and it looks the same as the one it replaced. The item itself is inexpensive but replacing it by myself was difficult. I had a really hard time unscrewing the original sensor out of the gas pipe due to a lack of space to rotate the ratchet. In addition, the connector was too high to reach with both hands from under the car, where the sensor is located. You would need one hand to jam a flathead screwdriver into the connector to release the hook, and the other hand to pull the wire out of the connector. There was not enough space for two hands to do this from under the car! Luckily I had my brother helped me out. He stood next to the car and reached down with one hand to take a screwdriver to release the wire from the connector, and I pulled the wire from under the car. After that, installing the new sensor was a much easier step. I also want to note: the error code that prompted me to replace this sensor was "Code: PO137, Define: O2 Sensor Circuit Low Voltage Bank 1 Sensor 2" I also replaced the Bank 1 Sensor 1 at the same time. Bank 1 Sensor 1 is located in the front of the engine and it is called the Air/Fuel Sensor, product # 234-9022. The reason I replaced both sensors was because I learned from a mechanic who told me: when Sensor 2 gives an error message, it is usually caused by the failing of sensor 1. When sensor 1 fails, too much or too little oxygen flow into the engine and such condition creates too much or too little oxygen leaving the engine which in turn causes sensor 2 to show an error to the computer. Therefore, to completely solve the problem, one should replace both sensors at the same time. That was what I did. As soon as I replaced both sensors, the error code went away. Besides, some online forums I visited have indicated that Oxygen sensors and Air/fuel sensors tend to last about 10 years. That's exactly how old my car is when the error code showed up. I learned about this repair routine from others on YouTube and other online forums, so I appreciate those people's videos and inputs. This DIY repair saved me at least $500 compared to having to leave the car at a repair shop or dealership. As such, I took the time to write this review in the hope that I'd paid my money-savings forward to someone who might be facing a similar problem.

Very easy to install, perfect fit. Won't replace the O2 sensor upstream of the catalytic converter of the 4-cylinder 2012 Toyota RAV4 though, which is also referred to as the Air/Fuel sensor. The wiring harness connections are "keyed" differently and won't fit. Sadly that sensor is more than twice the price. The secret to removing the old sensor is to run the cold engine just briefly to thermally expand the exhaust pipe, without making things too hot to touch. This Denso brand sensor comes with copper-based anti-seize compound included.