Review on Denso 234-9123 Oxygen Sensor: Reliable Air and Fuel Ratio Monitoring Device by Jermaine Batista

Used on Legacy 2.5I 2006 with 180,000km mileage. Why: The car kept going into safe mode, and it happened more often. Quality: This is an OEM part. Fits perfectly. Notes: I originally bought a throttle position sensor from a junkyard for $40, but that didn't fix the problem. My idea was to start with the cheapest item and work up if needed. My car never issued an O2 sensor code, but it did give a TPS code. Replaced that sensor and no more problems! Reading blogs helps a lot. Also, I suggest buying the offset rosette that Revain offers. Makes work even easier. I put up with my Subaru's quirks because it's so easy to work with.