HomeEmission Control > SensorsWalker 250-24718 Oxygen Sensor - Downstream
Part #: 250-24718

Walker 250-24718 Oxygen Sensor - Downstream

Walker Products OE, Downstream
25 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$89.52Free 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, Downstream
Fitment: Mazda, 3
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST

Overview of Walker 250-24718 Oxygen Sensor for Mazda 3

The Walker 250-24718 oxygen sensor is designed specifically for Mazda 3 models, providing precise emission control and engine performance monitoring. This heated oxygen sensor features a threaded mounting type and a radiused polygon female connector for secure installation.

  • Wiring harness length: 28.07 inches
  • Wire gauge measurement: 20 gauge
  • Heated sensor type for faster response
  • Specific fit for Mazda 3
  • Four-wire configuration
  • Radiused polygon female connector
  • Thread diameter: 18.0 mm
  • Overall length: 31.61 inches
  • Threaded mounting type

Detailed Product Description

This Walker Products OE oxygen sensor (part number 250-24718) is engineered to meet the exact specifications of Mazda 3 vehicles. The heated sensor design allows for quicker activation and more accurate readings of exhaust oxygen levels, which is critical for optimal fuel mixture and emissions control. The four-wire setup includes both sensor and heater circuits, ensuring reliable operation under various engine conditions. The 18.0 mm threaded mounting and radiused polygon female connector provide a secure and precise fit, minimizing installation issues and ensuring consistent sensor performance.

Walker Products OE is a product line focused on delivering original equipment quality and fitment. This ensures that the 250-24718 oxygen sensor matches the factory specifications for Mazda 3 models, supporting proper engine management and emission system function.

Common Applications and Issues Addressed

  • Replacement for faulty or failing oxygen sensors in Mazda 3
  • Helps resolve rough idling and poor fuel economy
  • Reduces engine hesitation and misfires related to oxygen sensor faults
  • Supports emission system compliance and reduces exhaust emissions
  • Prevents check engine light triggers related to oxygen sensor malfunction

Installation Notes and Tips

  • Ensure vehicle compatibility with Mazda 3 models before installation
  • Use appropriate tools for removing the threaded sensor to avoid damage
  • Check wiring harness length (28.07 inches) for routing and connection clearance
  • Verify connector type matches the vehicle’s female radiused polygon connector
  • Follow torque specifications for the 18.0 mm threaded mounting to prevent leaks

Quality Assurance and Warranty

The Walker 250-24718 oxygen sensor is manufactured to meet stringent quality standards consistent with original equipment. Walker Products OE parts undergo rigorous testing to ensure durability and reliable performance in emission control systems. Warranty coverage details should be confirmed with the point of purchase or manufacturer documentation.

BrandWalker
Part Number250-24718
PositionWalker Products OE, Downstream
Connector GenderFemale
Connector ShapeRadiused Polygon
Mounting TypeThreaded
Overall Length31.61
Sensor TypeHeated
Thread Diameter18.0
Universal Or Specific FitSpecific
Wire Gauge Measurement20
Wire Quantity4
Wiring Harness Length28.07

This part fits 25 vehicles. Search below:

YearMakeModelLitersCylindersFuel TypePositionNotes
2009Mazda32.3LL4GASDownstreamDownstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE
2009Mazda32.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products OE
2009Mazda32.0LL4GASDownstreamDownstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE
2009Mazda32.3LL4GASDownstreamDownstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE
2009Mazda32.0LL4GASDownstreamDownstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE
2009Mazda32.3LL4GASDownstreamDownstream oxygen sensor for second bank, sensor 1, non-California emissions.; Walker Products OE
2009Mazda32.0LL4GASDownstreamDownstream oxygen sensor for second bank, sensor 1, non-California emissions.; Walker Products OE
2008Mazda32.3LL4GASDownstreamDownstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE
2008Mazda32.0LL4GASDownstreamNon Calif-ESV; B1S3; No Calif-ESV; Downstream; Walker Products OE
2008Mazda32.3LL4GASDownstreamDownstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE
2008Mazda32.0LL4GASDownstreamNon-Calif-ESV/No Calif-ESV Downstream B1S3 Oxygen Sensor; Walker Products OE
2008Mazda32.3LL4GASDownstreamDownstream oxygen sensor for second bank, sensor 1, non-California emissions.; Walker Products OE
2008Mazda32.0LL4GASDownstreamNon Calif-ESV; B1S3; Downstream; Walker Products OE
2007Mazda32.3LL4GASDownstreamDownstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE
2007Mazda32.0LL4GASDownstreamDownstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE
2007Mazda32.3LL4GASDownstreamDownstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE
2007Mazda32.0LL4GASDownstreamDownstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE
2007Mazda32.3LL4GASDownstreamDownstream oxygen sensor for second bank, sensor 1, non-California emissions.; Walker Products OE
2007Mazda32.0LL4GASDownstreamDownstream oxygen sensor for second bank, sensor 1, non-California emissions.; Walker Products OE
2006Mazda32.3LL4GASDownstreamDownstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE
2006Mazda32.0LL4GASDownstreamDownstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE
2006Mazda32.3LL4GASDownstreamDownstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE
2006Mazda32.0LL4GASDownstreamDownstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE
2006Mazda32.3LL4GASDownstreamDownstream oxygen sensor for second bank, sensor 1, non-California emissions.; Walker Products OE
2006Mazda32.0LL4GASDownstreamDownstream oxygen sensor for second bank, sensor 1, non-California emissions.; 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.