HomeEmission Control > SensorsWalker 250-24631 Oxygen Sensor - Upstream or Upstream Right
Part #: 250-24631

Walker 250-24631 Oxygen Sensor - Upstream or Upstream Right

Walker Products OE, Upstream
⚙️ 29 vehicles fit this part
🔍
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$61.78Free 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
📦Walker Products OE, Upstream
🚗Fitment: Mitsubishi, Lancer, Montero, and Montero Sport
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

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.

BrandWalker
Part Number250-24631
PositionWalker Products OE, Upstream
Connector GenderMale
Connector ShapeRadiused Polygon
Mounting TypeThreaded
Overall Length29.65
Sensor TypeHeated
Thread Diameter18.0
Universal Or Specific FitSpecific
Wire Gauge Measurement20
Wire Quantity4
Wiring Harness Length26.1

This part fits 29 vehicles. Search below:

YearMakeModelLitersCylindersFuel TypePositionNotes
2006MitsubishiLancer2.0LL4GASUpstreamBank 1 Sensor 1 needs an upstream oxygen sensor.; Walker Products OE
2006MitsubishiLancer2.0LL4GASUpstreamFront oxygen sensor compatible with various vehicle models.; Walker Products OE
2006MitsubishiMontero3.8LV6GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products OE
2005MitsubishiLancer2.0LL4GASUpstreamBank 1 Sensor 1 needs an upstream oxygen sensor.; Walker Products OE
2005MitsubishiLancer2.0LL4GASUpstreamFront oxygen sensor compatible with various vehicle models.; Walker Products OE
2005MitsubishiMontero3.8LV6GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products OE
2004MitsubishiLancer2.0LL4GASUpstreamTo 09/01/03; B1S1; Al 09/01/03; Upstream; Walker Products OE
2004MitsubishiLancer2.0LL4GASUpstreamFrom 09/02/03; B1S1; Del 02/09/03; Upstream; Walker Products OE
2004MitsubishiLancer2.0LL4GASUpstreamTo 09/01/03; Al 09/01/03; Upstream; B1S1; Walker Products OE
2004MitsubishiLancer2.0LL4GASUpstreamFrom 09/02/03; Del 02/09/03; Upstream; B1S1; Walker Products OE
2004MitsubishiLancer2.0LL4GASUpstreamTo 09/01/03; B1S1; Upstream; Walker Products OE
2004MitsubishiLancer2.0LL4GASUpstreamFrom 09/02/03; B1S1; Upstream; Walker Products OE
2004MitsubishiMontero3.8LV6GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products OE
2004MitsubishiMontero Sport3.5LV6GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products OE
2003MitsubishiLancer2.0LL4GASUpstreamBank 1 Sensor 1 needs an upstream oxygen sensor.; Walker Products OE
2003MitsubishiLancer2.0LL4GASUpstreamFront oxygen sensor compatible with various vehicle models.; Walker Products OE
2003MitsubishiMontero3.8LV6GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products OE
2003MitsubishiMontero Sport3.5LV6GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products OE
2003MitsubishiMontero Sport3.0LV6GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products OE
2002MitsubishiMontero3.5LV6GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products OE
2002MitsubishiMontero Sport3.5LV6GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products OE
2002MitsubishiMontero Sport3.0LV6GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products OE
2001MitsubishiMontero3.5LV6GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products OE
2001MitsubishiMontero Sport3.5LV6GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products OE
2001MitsubishiMontero Sport3.0LV6GASUpstream RightInstall upstream oxygen sensor on the right side.; Walker Products OE
2000MitsubishiMontero Sport3.5LV6GASUpstream RightCalifornia emissions; upstream right position; Walker Products OE
2000MitsubishiMontero Sport3.0LV6GASUpstream RightCalifornia emissions; upstream right position; Walker Products OE
1999MitsubishiMontero Sport3.5LV6GASUpstream RightCalifornia emissions; upstream right position; Walker Products OE
1999MitsubishiMontero Sport3.0LV6GASUpstream RightCalifornia 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.