🔧 Enhanced Denso 234-9109 Air Fuel Sensor for Optimal Engine Performance Review

This is exactly the same as my 2014 Impreza. I replaced it and turned out the check engine light, then drove the car with the scanner plugged in and all my emissions monitors passed with no issues.

has only been in the Forester for 12 years, about 2 months and 300 miles but still no CEL and a "greasy" smell from the exhaust. Looks the same as the factory sensor but saved a ton of money. Many Thanks. I will update the review if anything changes.

2012 Subaru Forester 2.5 (Without Turbo) Exact Replacement OEM. Green upstream, black downstream. Do yourself a favor and swap downstream right now. Revain sells downstream. Simple replacement to clear code P0420. No codes after 2 weeks. Forester has 120k.

OEM sensor brand for Subaru applications. Fixed code p0174 (bad bank 1) for my 2011 Forester. It came with a small blister pack of copper anti-seize thread lubricant. I'm assuming it's the same sensor used in every Subarus with a naturally aspirated 2.5L engine. This is a broadband sensor for those who may not know or be curious.

Changing this was a big project for me. This part isn't cheap so I rode it a lot. The item arrived in brand new packaging. Nothing looked fake. The product contained what I thought was an ant compound that looked like liquid copper. The wiring is screwed properly and the wiring was fine. Possibly saved me hundreds of dollars.

My check engine light came on. I hooked up my scanner and got the code for a bad air/fuel ratio sensor. This Denso sensor is exactly what Subaru uses as an OEM product, except you don't pay a premium for Subaru putting their logo on it. Installation was easy, fit perfectly, 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 to buy. I highly recommend this product.