Denso 234-9109 Air Fuel Sensor

I got a check engine light. I hooked up my scanner and got code for defective Air/Fuel Ratio Sensor.This Denso Sensor is exactly what Subaru uses as its OEM product, except, you don't pay a premium for Subaru slapping their logo on it. Installation was straight forward, fit perfect just like the original sensor and took about 30-Minutes. I cleared the code and the car runs great and no more annoying check engine light.If you own a Subaru, Denso is the sensor you need to buy. I highly recommend this product.

Works well like the original

Perfect fit got rid of code

factory original Subaru oxygen sensor! The subaru's use denso sensors. 5/5 stars.

The part was not to hard to install. And it saved me a TON compared to what the Subaru dealer wanted to charge Just watch a Youtube video first to see if its something you can do. The video was very helpful.

This upstream along with the other O2 sensor solved my check engine. Thank you.

P0134 code came up on a 2013 Impreza, O2 "No signal." Circuit continuity and resistance was fine per the OE service manual, which created a rabbit hole for troubleshooting. Continuity to wires in the vehicle harness were also good.The service manual failed to note that there should also be no continuity from the heater pins to the other 2 pins on a good sensor. In my case there was a very large resistance value (in the M-Ohm range) suggesting something was shorted internally. The only way I was able to confirm this was by cross checking with a Denso AF sensor on a 2010 Camry (same sensor with a different wire length), then when the new sensor arrived, it behaved similarly to the one in the Camry (~Infinite resistance when measuring from the heater circuit to the non heater circuit vs some resistance in the bad one). Replaced, and the code went away immediately.

Exact replacement for my old Subaru, no trouble light since installation.