Walker Products 250-54027 oxygen sensor for the 2006-2010 Subaru Forester H4 2.5L and other vehicles measures the oxygen content of the exhaust gas. This 4-wire wide-band air fuel ratio sensor sits in the upstream position and gives the ECU the diagnostic feedback it needs.
- Reads exhaust oxygen content to monitor the air fuel ratio and combustion efficiency
- Monitors exhaust gases to help reduce pollutants
- Measures oxygen levels so the air-fuel mixture can be fine-tuned for fuel economy
- Electrodes coated with a gas-permeable platinum layer
- Coating protects electrode surfaces from contamination and erosion by combustion residue and particulates
Quick facts
- Part: Walker Products 250-54027 oxygen sensor
- Fits: 2006-2010 Subaru Forester H4 2.5L and other vehicles
- Position: Upstream
- Condition: New
A failing oxygen sensor can show up as the engine running poorly, higher fuel consumption, more exhaust emissions or the malfunction indicator light coming on. A vacuum leak can cause some of the same symptoms, so these signs alone do not prove the sensor is at fault. With the engine off and cool, look over the sensor, wiring harness and connector for physical damage.
Fits
Among the many vehicles it fits are the 2006-2010 Subaru Forester H4 2.5L and the 2004-2009 Subaru Outback H4 2.5L, and it works as an oxygen sensor for the 2006-2011 Subaru Impreza H4 2.5L. This listing is one sensor, and the 2006-2010 Subaru Forester H4 2.5L takes one. Owners of other Subaru or Saab models can find their car in the "Vehicles it fits" section.
Specifications
Fit and size
- Position: Upstream
- Quantity per vehicle: 1
- Wires: 4
Build and materials
- Type: Wide-band air fuel ratio sensor
- Electrode coating: gas-permeable platinum layer
- Condition: New
Product information is for general reference and may contain errors. See our Disclaimer.
Frequently Asked Questions
Is this the right Subaru Outback oxygen sensor for a 2004-2009 model with the H4 2.5L engine?
Yes, Walker Products 250-54027 fits the 2004-2009 Subaru Outback H4 2.5L, which takes one. For a different model, look it up in the "Vehicles it fits" section.
Will this 2010 Subaru Forester oxygen sensor fit the H4 2.5L engine in the 2006-2010 model years?
Yes. Walker Products 250-54027 is listed for the 2006-2010 Subaru Forester H4 2.5L, which covers the 2010 model year, and the car takes one.
Is the Walker Products 250-54027 a wide-band oxygen sensor?
Yes. It is a 4-wire wide-band air fuel ratio sensor made for the upstream position.
What is the platinum coating on this oxygen sensor for?
The electrodes are coated with a gas-permeable platinum layer. The coating prevents contamination and erosion of the electrode surfaces by combustion residue and particulates in the exhaust gases.
Is this oxygen sensor made for one spot in the exhaust or for any position?
This oxygen sensor is made for its specific application and fitment position, which here is upstream, and it gives the ECU the diagnostic feedback it requires.
