Oxygen Sensor for 2008-2014 Subaru Impreza & More - Walker 250-54079

Walker Products 250-54079 oxygen sensor for the 2008-2014 Subaru Impreza H4 2.5L and other vehicles measures the amount of oxygen in the exhaust gas. This upstream sensor is wide-band and uses four wires to report the air-fuel ratio to the ECU.

• Measures exhaust oxygen levels to help fine-tune the air-fuel ratio for fuel economy
• Monitors exhaust gases to help reduce pollutants
• Coating protects the electrode surfaces from contamination and erosion by combustion residue and particulates
• Electrodes made of a gas-permeable platinum layer
• Built for its specific application and position, with the diagnostic feedback the ECU requires

Quick facts

• Part: Walker Products 250-54079 oxygen sensor
• Fits: 2008-2014 Subaru Impreza H4 2.5L and other vehicles
• Position: Upstream
• Condition: New

A failing sensor can show up as rough running, higher fuel consumption or a lit malfunction indicator light. A damaged wiring harness or connector may upset the readings too, so look both over for damage, with the engine off and cool, before you replace the sensor.

Fits

It fits the 2008-2014 Subaru Impreza H4 2.5L and the 2014 Subaru WRX STI H4 2.5L, and both cars take one upstream sensor. This listing is one sensor.

Specifications