Walker Products 250-25172 oxygen sensor for the 2021-2025 Mazda 3 4-cylinder 2.5L and other vehicles measures the oxygen content of the exhaust gas. This upstream sensor tracks the air-fuel ratio and gives the ECU diagnostic feedback.
- Coating guards the electrode surfaces against contamination and erosion from combustion residue and particulates
- Electrodes carry a gas-permeable platinum layer
- Wide-band, heated sensor with a threaded mount
- Made for its specific application and fitment position
Quick facts
- Part: Walker Products 250-25172 oxygen sensor
- Fits: 2021-2025 Mazda 3 4-cylinder 2.5L and other vehicles
- Position: Upstream
- Condition: New
A failing sensor can show up as rough running, higher fuel consumption, more exhaust emissions or a lit malfunction indicator light, but those signs have other possible sources too. With the engine off and cool, look over the sensor, its wiring harness and the connector for physical damage to help find the cause before you replace anything.
Fits
This direct-fit sensor is listed for a wide range of Mazda models, including the 2021-2025 Mazda CX-30 4-cylinder 2.5L and the 2023-2025 Mazda CX-50 4-cylinder 2.5L. If your car is not named here, use the "Vehicles it fits" section to find your own model, year and engine.
Specifications
Fit and size
- Position: Upstream
- Quantity per vehicle: 1
- Wrench size: 22 mm
- Connector: female, rectangular
Build and materials
- Sensor type: wide-band, heated
- Mounting type: threaded
- Terminals: male spade
- Electrodes: gas-permeable platinum layer
- Grade: standard replacement
- Condition: New
- Country of origin: United States
In the box
One upstream oxygen sensor. These vehicles take one in this position.
Product information is for general reference and may contain errors. See our Disclaimer.
Frequently Asked Questions
Is the Walker Products 250-25172 oxygen sensor right for the 2021-2025 Mazda 3 4-cylinder 2.5L?
Yes. Walker Products 250-25172 is listed for the 2021-2025 Mazda 3 4-cylinder 2.5L, and that car takes one in the upstream position. Use the "Vehicles it fits" section to find other models.
Is this Walker Products oxygen sensor wide-band and heated?
Yes. Walker Products 250-25172 is a heated wide-band sensor with a threaded mount and a 22 mm wrench size.
How are the electrodes on this oxygen sensor protected?
The electrodes carry a gas-permeable platinum layer, and a coating guards the electrode surfaces against contamination and erosion from combustion residue and particulates in the exhaust.
What signs can a failing upstream oxygen sensor cause?
Rough running, higher fuel consumption, more exhaust emissions or a lit malfunction indicator light. Those signs have other possible sources, so a shop can read the stored fault codes.
Does this listing include one oxygen sensor or two?
One. This listing is a single upstream oxygen sensor, and the car takes one in this position.
