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WalkerPart #: 250-25175
Walker 250-25175 Oxygen Sensor - Upstream
⚙️ 19 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$224.76Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship
Most orders ship same-day if ordered before 1pm CST.
✅OE Direct Replacement — Bolt-on fit, no modifications needed
📦OE Base Sensor, Upstream
🚗Fitment: Mazda, 3, CX-30, CX-5, and CX-50
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST
Not what you need? Click here for all Oxygen Sensor options
Walker 250-25175 Oxygen Sensor - Upstream
| Brand | Walker |
| Part Number | 250-25175 |
| Position | OE Base Sensor, Upstream |
| Heated | Yes |
| Sensor Type | Wide-band |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 5 |
| Connector Shape | Rectangle |
| Wrench Size | 22 |
| Thread Size | M18 - 1.5 |
This part fits 19 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2025 | Mazda | 3 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2025 | Mazda | CX-30 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2025 | Mazda | CX-5 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2025 | Mazda | CX-50 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2024 | Mazda | 3 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2024 | Mazda | CX-30 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2024 | Mazda | CX-5 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2024 | Mazda | CX-50 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2023 | Mazda | 3 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2023 | Mazda | CX-30 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2023 | Mazda | CX-5 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2023 | Mazda | CX-50 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2022 | Mazda | 3 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2022 | Mazda | CX-30 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2022 | Mazda | CX-5 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2021 | Mazda | 3 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2021 | Mazda | CX-30 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2020 | Mazda | 3 | 2.5L | L4 | Upstream | OE Base Sensor |
| 2019 | Mazda | 3 | 2.5L | L4 | Upstream | OE Base Sensor |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.