OE Quality
60-Day Returns

Walker 250-24631 Oxygen Sensor - Upstream or Upstream Right
Overview of Walker 250-24631 Oxygen Sensor for Mitsubishi Vehicles
The Walker 250-24631 oxygen sensor is designed specifically for Mitsubishi Lancer, Montero, and Montero Sport models. This heated oxygen sensor ensures accurate emissions control and optimal engine performance by monitoring exhaust gases effectively.
- Heated sensor type for faster response times
- Specific fit for Mitsubishi Lancer, Montero, and Montero Sport
- 26.1-inch wiring harness length for flexible installation
- 20 gauge wire measurement with 4 wires for reliable signal transmission
- Radiused polygon male connector for secure connection
- Threaded mounting type with 18.0 mm thread diameter
- Overall length of 29.65 inches for proper fitment
Walker Products OE Brand Line Details
The Walker Products OE line focuses on delivering original equipment quality parts that meet or exceed factory specifications. The 250-24631 oxygen sensor from this line is engineered to provide precise emissions control and durability, maintaining the performance standards expected in Mitsubishi vehicles.
Technical Description and Features
This oxygen sensor features a heated design that allows it to reach operating temperature quickly, improving fuel efficiency and reducing emissions. The 4-wire configuration supports both the sensor signal and heater circuit, ensuring consistent operation. The radiused polygon male connector and threaded mounting type with an 18.0 mm diameter provide a secure and exact fit, minimizing installation issues. With a wiring harness length of 26.1 inches and an overall length of 29.65 inches, this sensor is tailored for the specific layout of Mitsubishi Lancer, Montero, and Montero Sport exhaust systems.
Common Applications and Issues Addressed
- Helps maintain proper air-fuel mixture for efficient combustion
- Reduces harmful emissions by providing accurate oxygen level data
- Prevents engine performance problems related to faulty sensors
- Addresses check engine light triggers related to oxygen sensor faults
- Supports smooth engine idling and acceleration response
Installation Notes and Tips
Ensure the vehicle is cool before installation to avoid burns. Use appropriate tools to remove the old sensor and avoid damaging the threaded mounting hole. Verify the connector type matches the vehicle harness before installation. The 26.1-inch wiring harness length allows for flexible routing, but avoid sharp bends or contact with hot exhaust components. Torque the sensor to manufacturer specifications to ensure a proper seal.
Quality Assurance and Warranty
Walker Products OE oxygen sensors are manufactured to meet strict quality standards, ensuring reliable performance and durability. This part is backed by Walker's quality assurance protocols, providing confidence in fitment and function for Mitsubishi Lancer, Montero, and Montero Sport models. Warranty details are available through authorized distributors and typically cover defects in materials and workmanship.
| Brand | Walker |
| Part Number | 250-24631 |
| Position | Walker Products OE, Upstream |
| Connector Gender | Male |
| Connector Shape | Radiused Polygon |
| Mounting Type | Threaded |
| Overall Length | 29.65 |
| Sensor Type | Heated |
| Thread Diameter | 18.0 |
| Universal Or Specific Fit | Specific |
| Wire Gauge Measurement | 20 |
| Wire Quantity | 4 |
| Wiring Harness Length | 26.1 |
This part fits 29 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2006 | Mitsubishi | Lancer | 2.0L | L4 | GAS | Upstream | Bank 1 Sensor 1 needs an upstream oxygen sensor.; Walker Products OE |
| 2006 | Mitsubishi | Lancer | 2.0L | L4 | GAS | Upstream | Front oxygen sensor compatible with various vehicle models.; Walker Products OE |
| 2006 | Mitsubishi | Montero | 3.8L | V6 | GAS | Upstream Right | Install upstream oxygen sensor on the right side.; Walker Products OE |
| 2005 | Mitsubishi | Lancer | 2.0L | L4 | GAS | Upstream | Bank 1 Sensor 1 needs an upstream oxygen sensor.; Walker Products OE |
| 2005 | Mitsubishi | Lancer | 2.0L | L4 | GAS | Upstream | Front oxygen sensor compatible with various vehicle models.; Walker Products OE |
| 2005 | Mitsubishi | Montero | 3.8L | V6 | GAS | Upstream Right | Install upstream oxygen sensor on the right side.; Walker Products OE |
| 2004 | Mitsubishi | Lancer | 2.0L | L4 | GAS | Upstream | To 09/01/03; B1S1; Al 09/01/03; Upstream; Walker Products OE |
| 2004 | Mitsubishi | Lancer | 2.0L | L4 | GAS | Upstream | From 09/02/03; B1S1; Del 02/09/03; Upstream; Walker Products OE |
| 2004 | Mitsubishi | Lancer | 2.0L | L4 | GAS | Upstream | To 09/01/03; Al 09/01/03; Upstream; B1S1; Walker Products OE |
| 2004 | Mitsubishi | Lancer | 2.0L | L4 | GAS | Upstream | From 09/02/03; Del 02/09/03; Upstream; B1S1; Walker Products OE |
| 2004 | Mitsubishi | Lancer | 2.0L | L4 | GAS | Upstream | To 09/01/03; B1S1; Upstream; Walker Products OE |
| 2004 | Mitsubishi | Lancer | 2.0L | L4 | GAS | Upstream | From 09/02/03; B1S1; Upstream; Walker Products OE |
| 2004 | Mitsubishi | Montero | 3.8L | V6 | GAS | Upstream Right | Install upstream oxygen sensor on the right side.; Walker Products OE |
| 2004 | Mitsubishi | Montero Sport | 3.5L | V6 | GAS | Upstream Right | Install upstream oxygen sensor on the right side.; Walker Products OE |
| 2003 | Mitsubishi | Lancer | 2.0L | L4 | GAS | Upstream | Bank 1 Sensor 1 needs an upstream oxygen sensor.; Walker Products OE |
| 2003 | Mitsubishi | Lancer | 2.0L | L4 | GAS | Upstream | Front oxygen sensor compatible with various vehicle models.; Walker Products OE |
| 2003 | Mitsubishi | Montero | 3.8L | V6 | GAS | Upstream Right | Install upstream oxygen sensor on the right side.; Walker Products OE |
| 2003 | Mitsubishi | Montero Sport | 3.5L | V6 | GAS | Upstream Right | Install upstream oxygen sensor on the right side.; Walker Products OE |
| 2003 | Mitsubishi | Montero Sport | 3.0L | V6 | GAS | Upstream Right | Install upstream oxygen sensor on the right side.; Walker Products OE |
| 2002 | Mitsubishi | Montero | 3.5L | V6 | GAS | Upstream Right | Install upstream oxygen sensor on the right side.; Walker Products OE |
| 2002 | Mitsubishi | Montero Sport | 3.5L | V6 | GAS | Upstream Right | Install upstream oxygen sensor on the right side.; Walker Products OE |
| 2002 | Mitsubishi | Montero Sport | 3.0L | V6 | GAS | Upstream Right | Install upstream oxygen sensor on the right side.; Walker Products OE |
| 2001 | Mitsubishi | Montero | 3.5L | V6 | GAS | Upstream Right | Install upstream oxygen sensor on the right side.; Walker Products OE |
| 2001 | Mitsubishi | Montero Sport | 3.5L | V6 | GAS | Upstream Right | Install upstream oxygen sensor on the right side.; Walker Products OE |
| 2001 | Mitsubishi | Montero Sport | 3.0L | V6 | GAS | Upstream Right | Install upstream oxygen sensor on the right side.; Walker Products OE |
| 2000 | Mitsubishi | Montero Sport | 3.5L | V6 | GAS | Upstream Right | California emissions; upstream right position; Walker Products OE |
| 2000 | Mitsubishi | Montero Sport | 3.0L | V6 | GAS | Upstream Right | California emissions; upstream right position; Walker Products OE |
| 1999 | Mitsubishi | Montero Sport | 3.5L | V6 | GAS | Upstream Right | California emissions; upstream right position; Walker Products OE |
| 1999 | Mitsubishi | Montero Sport | 3.0L | V6 | GAS | Upstream Right | California emissions; upstream right position; Walker Products OE |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.