Walker Products 350-64021 oxygen sensor for the 2015-2016 Subaru WRX H4 2.5L and other vehicles measures combustion efficiency from the amount of oxygen in the exhaust gas. This Walker Products oxygen sensor is a 4-wire, wide-band air fuel ratio type, made for its specific application and fitment position.
- Monitors exhaust gases and reduces pollutants for a cleaner environment
- Determines the oxygen content of the exhaust gas and monitors the air fuel ratio for combustion efficiency
- Electrodes with a gas-permeable platinum layer
- Measures oxygen levels to help fine-tune the air-fuel mixture and support fuel economy
- Coating protects the electrode surfaces from combustion residue and particulates in the exhaust
Quick facts
- Part: Walker Products 350-64021 oxygen sensor
- Fits: 2015-2016 Subaru WRX H4 2.5L and other vehicles
- Position: Upstream
- Condition: New
A failing sensor can show up as rough running, higher fuel consumption, higher exhaust emissions or a lit malfunction indicator light. Before you replace the sensor, look over its wiring harness and connector for physical damage, since damage there can look much the same from the driver's seat.
Fits
The 2015-2016 Subaru WRX H4 2.5L, the 2004-2010 Subaru Forester H4 2.5L and the 2005-2007 Subaru Outback H4 2.5L are among the vehicles this sensor fits.
Specifications
Fit and size
- Position: Upstream
- Quantity per vehicle: 1
- Thread size: M18 - 1.5
Build and materials
- Type: wide-band air fuel ratio sensor
- Wires: 4
- Electrodes: gas-permeable platinum layer
- Condition: New
In the box
This listing is a single oxygen sensor, and the fitment calls for one in this upstream position.
Frequently Asked Questions
Is this the Subaru Outback oxygen sensor for a 2005-2007 H4 2.5L?
Yes. Walker Products 350-64021 is listed for the 2005-2007 Subaru Outback H4 2.5L as an upstream sensor, one per vehicle. If your Subaru is a different model or year, look it up in the "Vehicles it fits" section.
Is this a Subaru WRX oxygen sensor for the 2015-2016 H4 2.5L?
Yes. Walker Products 350-64021 is listed for the 2015-2016 Subaru WRX H4 2.5L in the upstream position, and the vehicle takes one.
Is the 350-64021 sensor a wide-band type?
Yes. This is a 4-wire, wide-band air fuel ratio sensor that determines the oxygen content of the exhaust gas to monitor the air fuel ratio.
What can a failing upstream oxygen sensor cause?
Rough running, higher fuel consumption, higher exhaust emissions or a lit malfunction indicator light can all go with a failing sensor. Newer vehicles may also store fault codes in the ECU, which a shop can read.
What does the coating on this oxygen sensor protect against?
The coating guards the electrode surfaces against contamination and erosion from combustion residue and particulates in the exhaust gases. The electrodes themselves carry a gas-permeable platinum layer.
