Walker Products 250-54058 oxygen sensor for the 2004-2010 Subaru Forester H4 2.5L and other vehicles measures the oxygen in exhaust gas to track combustion efficiency. Walker builds each part number for its specific application and fitment position, so it gives the ECU the diagnostic feedback that position needs.
- Wide-band air-fuel ratio sensor with four wires
- Monitors exhaust gases to help reduce pollutants
- Electrodes made of a gas-permeable platinum layer
- Measures oxygen levels to fine-tune the air-fuel mixture and help improve fuel economy
- Coating guards the electrode surfaces against contamination and erosion from combustion residue and particulates
Quick facts
- Part: Walker Products 250-54058 oxygen sensor
- Fits: 2004-2010 Subaru Forester H4 2.5L and other vehicles
- Position: Upstream
- Condition: New
A failing sensor can show up as rough running, higher fuel use, more exhaust emissions or a lit malfunction indicator light, and newer vehicles may store a related fault code. Before you replace the sensor, look over it, its wiring harness and its connector for physical damage, with the engine off and cool.
Fits
This oxygen sensor for the 2004-2008 Subaru Impreza H4 2.5L also fits the 2005-2007 Subaru Outback H4 2.5L, among many other vehicles. Open the "Vehicles it fits" section and search your own car's model and engine to see if it takes this sensor.
Specifications
Fit and size
- Position: Upstream
- Quantity per vehicle: 1
- Number of wires: 4
Build and materials
- Type: Wide-band air-fuel ratio sensor
- Electrodes: gas-permeable platinum layer
- Condition: New
In the box
One oxygen sensor. This listing is one sensor, and the upstream position takes one.
Frequently Asked Questions
Is this the right oxygen sensor for the 2005-2007 Subaru Outback H4 2.5L?
Yes. Walker Products 250-54058 is listed for the 2005-2007 Subaru Outback H4 2.5L as an upstream sensor, and that position takes one.
Is this the oxygen sensor for a 2010 Subaru Forester H4 2.5L?
Yes. The 2004-2010 Subaru Forester H4 2.5L is listed with this sensor in the upstream position.
Is the Walker Products oxygen sensor wide-band?
Yes. Walker Products 250-54058 is a 4-wire wide-band air-fuel ratio sensor that measures the oxygen content of the exhaust gas.
What can a worn wide-band oxygen sensor do to engine running?
It can lead to rough running, higher fuel use, more emissions or a lit malfunction indicator light. Other faults can show up the same way, and a shop can read any stored codes.
What does the coating on this oxygen sensor protect?
The coating guards the electrode surfaces against contamination and erosion from combustion residue and particulates in the exhaust gases. The electrodes use a gas-permeable platinum layer.
