Walker 350-341031 Oxygen Sensor - Downstream, Downstream Left or Downstream Right
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Walker
 Walker Products Aftermarket

Walker 350-341031 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Brand Walker 350-341031
Position Downstream
Connector Gender Female
Overall Length 34.57
Sensor Type Heated
Thread Diameter 18.00
Universal Or Specific Fit Specific
Wire Gauge Measurement 20
Wire Quantity 4
Wiring Harness Length 31.02
Product line Walker Products Aftermarket
Fits BMW · 152 vehicles

OE replacement. Engineered as an original-equipment-style sensor for specific applications.

Heated sensor. Provides the diagnostic feedback the ECU needs for proper operation.

Walker Products Aftermarket. Backed by decades of engine management and fuel system experience.

$82.63Free shipping
In stock · usually ships same day before 1pm CST
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Step 2 — Quantity
Order total $82.63
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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Walker 350-341031 Oxygen Sensor Overview

Walker Products 350-341031 is a heated oxygen sensor built as a specific-fit OE replacement for select BMW and Toyota applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions monitoring on vehicles such as the BMW 330i, BMW X3, and Toyota GR Supra.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for application-specific fitment, including downstream positions where accurate exhaust feedback is critical. This part number is matched to the vehicle, mounting position, and connector style for direct replacement service.

Key Features

  • Part number: 350-341031
  • Heated oxygen sensor for downstream applications
  • Specific-fit design for OE-style replacement
  • 4-wire configuration with female connector
  • 18.00 mm thread diameter
  • 31.02 in. wiring harness length and 34.57 in. overall length
  • Wire gauge: 20

Detailed Description

Walker Products 350-341031 is designed for downstream oxygen sensor service on select BMW and Toyota vehicles, including BMW 230i, 430i, 530i, X3, X4, 750i, and Toyota GR Supra applications. It is built to provide the ECU with the required exhaust feedback after the catalytic converter, supporting emissions system monitoring and proper engine management operation. The heated sensor design helps the unit reach operating temperature efficiently for consistent signal output.

As part of the Walker Products Aftermarket line, this oxygen sensor is manufactured for specific application fitment rather than universal use. That means the connector, harness length, and mounting thread are matched to the listed vehicle positions, including downstream right, downstream left, and downstream locations where specified. If your vehicle has a fault code related to the oxygen sensor circuit or downstream emissions monitoring, this part number is a direct replacement option to verify against the exact application.

What This Oxygen Sensor Helps Address

  • Check engine light related to downstream oxygen sensor faults
  • Poor fuel economy caused by inaccurate exhaust feedback
  • Rough engine operation tied to emissions sensor issues
  • Elevated exhaust emissions from a failing sensor
  • Stored ECU fault codes for the affected sensor circuit

Installation Notes and Tips

Confirm the exact year, make, model, and sensor position before ordering. This part is listed for specific downstream applications, including BMW downstream bank 1 sensor 2 and downstream right or left positions on select 7 Series and M models. Inspect the sensor wiring harness and connector for damage before installation, and compare the thread diameter, harness length, and connector style to the original unit.

For fitment-based searches, this part is commonly referenced for BMW 330i downstream oxygen sensor replacement, BMW X3 downstream right oxygen sensor replacement, and Toyota GR Supra downstream oxygen sensor replacement. The part number 350-341031 should be matched to the vehicle’s OE configuration before service.

Quality Assurance

Walker Products has produced engine management and sensor components since 1946 and operates as an ISO 9001/TS 16949 certified company. The 350-341031 oxygen sensor is built to support OE-style replacement requirements for the listed applications and to provide the diagnostic feedback expected by the vehicle ECU.

Related reading

This part fits 152 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelBody TypeLitersCylindersFuel TypePositionNotes
2024BMWX3——3.0LL6—Downstream RightOE Replacement
2024BMWX4——3.0LL6—Downstream RightOE Replacement
2024ToyotaGR Supra——2.0LL4—DownstreamOE Replacement
2023BMWX3——3.0LL6—Downstream RightOE Replacement
2023BMWX4——3.0LL6—Downstream RightOE Replacement
2023ToyotaGR Supra——2.0LL4—DownstreamOE Replacement
2022BMWX3——3.0LL6—Downstream RightOE Replacement
2022BMWX4——3.0LL6—Downstream RightOE Replacement
2022ToyotaGR Supra——2.0LL4—DownstreamOE Replacement
2021BMW230i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2021BMW230i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2021BMWX3——3.0LL6—Downstream RightOE Replacement
2021BMWX4——3.0LL6—Downstream RightOE Replacement
2021ToyotaGR Supra——2.0LL4—DownstreamOE Replacement
2020BMW118i——1.5LL3—DownstreamOE Replacement
2020BMW120i——2.0LL4—DownstreamOE Replacement
2020BMW230i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2020BMW230i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2020BMW420i——2.0LL4—DownstreamOE Replacement
2020BMW420i Gran Coupe——2.0LL4—DownstreamOE Replacement
2020BMW430i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2020BMW430i Gran Coupe——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2020BMW430i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2020BMW430i xDrive Gran Coupe——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2020BMW520i——2.0LL4—DownstreamEngine Designation : B48; OE Replacement
2020BMW530e——2.0LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2020BMW530e xDrive——2.0LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2020BMW530i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2020BMW530i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2020BMWM760Li xDrive——6.6LV12—Downstream RightOE Replacement
2020BMWX3——3.0LL6GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2020BMWX4——3.0LL6GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW118i——1.5LL3—DownstreamOE Replacement
2019BMW120i——2.0LL4—DownstreamOE Replacement
2019BMW230i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW230i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW330i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW330i GT xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW330i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW420i——2.0LL4—DownstreamOE Replacement
2019BMW420i Gran Coupe——2.0LL4—DownstreamOE Replacement
2019BMW430i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW430i Gran Coupe——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW430i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW430i xDrive Gran Coupe——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW520i——2.0LL4—DownstreamEngine Designation : B48; OE Replacement
2019BMW530e——2.0LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW530e xDrive——2.0LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW530i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW530i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW740e xDrive——2.0LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMW750i——4.4LV8GASDownstream RightCompatible downstream right Oxygen Sensor with bank 1 sensor 2.; Walker Products Aftermarket
2019BMW750i——4.4LV8GASDownstream LeftDownstream left oxygen sensor for bank 2 sensor 2; Walker Products Aftermarket
2019BMW750i——4.4LV8GASDownstream RightDownstream oxygen sensor compatible with right bank 2.; Walker Products Aftermarket
2019BMW750i——4.4LV8GASDownstream LeftBank 2, sensor 2 downstream oxygen sensor; Walker Products Aftermarket
2019BMW750i xDrive——4.4LV8GASDownstream RightCompatible downstream right Oxygen Sensor with bank 1 sensor 2.; Walker Products Aftermarket
2019BMW750i xDrive——4.4LV8GASDownstream LeftDownstream left oxygen sensor for bank 2 sensor 2; Walker Products Aftermarket
2019BMW750i xDrive——4.4LV8GASDownstream RightDownstream oxygen sensor compatible with right bank 2.; Walker Products Aftermarket
2019BMW750i xDrive——4.4LV8GASDownstream LeftBank 2, sensor 2 downstream oxygen sensor; Walker Products Aftermarket
2019BMW750Li——4.4LV8—Downstream RightOE Replacement
2019BMW750Li xDrive—Sedan4.4LV8—Downstream RightOE Replacement
2019BMWM550i xDrive——4.4LV8GASDownstream RightCompatible downstream right Oxygen Sensor with bank 1 sensor 2.; Walker Products Aftermarket
2019BMWM550i xDrive——4.4LV8GASDownstream LeftDownstream left oxygen sensor for bank 2 sensor 2; Walker Products Aftermarket
2019BMWM550i xDrive——4.4LV8GASDownstream RightDownstream oxygen sensor compatible with right bank 2.; Walker Products Aftermarket
2019BMWM550i xDrive——4.4LV8GASDownstream LeftBank 2, sensor 2 downstream oxygen sensor; Walker Products Aftermarket
2019BMWM760i xDrive——6.6LV12GASDownstream RightCompatible downstream right Oxygen Sensor with bank 1 sensor 2.; Walker Products Aftermarket
2019BMWM760i xDrive——6.6LV12GASDownstream LeftDownstream left oxygen sensor for bank 2 sensor 2; Walker Products Aftermarket
2019BMWM760i xDrive——6.6LV12GASDownstream RightDownstream oxygen sensor compatible with right bank 2.; Walker Products Aftermarket
2019BMWM760i xDrive——6.6LV12GASDownstream LeftBank 2, sensor 2 downstream oxygen sensor; Walker Products Aftermarket
2019BMWM760Li xDrive—Sedan6.6LV12—Downstream RightOE Replacement
2019BMWX3——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019BMWX4xDrive30i—2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW118i——1.5LL3—DownstreamOE Replacement
2018BMW120i——2.0LL4—DownstreamOE Replacement
2018BMW230i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW230i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW318i——1.5LL3—DownstreamOE Replacement
2018BMW330e——2.0LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW330i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW330i GT xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW330i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW420i——2.0LL4—DownstreamOE Replacement
2018BMW420i Gran Coupe——2.0LL4—DownstreamOE Replacement
2018BMW430i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW430i Gran Coupe——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW430i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW430i xDrive Gran Coupe——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW520i——2.0LL4—DownstreamEngine Designation : B48; OE Replacement
2018BMW530e——2.0LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW530e xDrive——2.0LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW530i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW530i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW550i xDrive——4.4LV8—Downstream RightOE Replacement
2018BMW740e xDrive——2.0LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018BMW750i——4.4LV8GASDownstream RightCompatible downstream right Oxygen Sensor with bank 1 sensor 2.; Walker Products Aftermarket
2018BMW750i——4.4LV8GASDownstream LeftDownstream left oxygen sensor for bank 2 sensor 2; Walker Products Aftermarket
2018BMW750i——4.4LV8GASDownstream RightDownstream oxygen sensor compatible with right bank 2.; Walker Products Aftermarket
2018BMW750i——4.4LV8GASDownstream LeftBank 2, sensor 2 downstream oxygen sensor; Walker Products Aftermarket
2018BMW750i xDrive——4.4LV8GASDownstream RightCompatible downstream right Oxygen Sensor with bank 1 sensor 2.; Walker Products Aftermarket
2018BMW750i xDrive——4.4LV8GASDownstream LeftDownstream left oxygen sensor for bank 2 sensor 2; Walker Products Aftermarket
2018BMW750i xDrive——4.4LV8GASDownstream RightDownstream oxygen sensor compatible with right bank 2.; Walker Products Aftermarket
2018BMW750i xDrive——4.4LV8GASDownstream LeftBank 2, sensor 2 downstream oxygen sensor; Walker Products Aftermarket
2018BMW750Li——4.4LV8—Downstream RightOE Replacement
2018BMW750Li xDrive——4.4LV8—Downstream RightOE Replacement
2018BMWM550i xDrive——4.4LV8GASDownstream RightCompatible downstream right Oxygen Sensor with bank 1 sensor 2.; Walker Products Aftermarket
2018BMWM550i xDrive——4.4LV8GASDownstream LeftDownstream left oxygen sensor for bank 2 sensor 2; Walker Products Aftermarket
2018BMWM550i xDrive——4.4LV8GASDownstream RightDownstream oxygen sensor compatible with right bank 2.; Walker Products Aftermarket
2018BMWM550i xDrive——4.4LV8GASDownstream LeftBank 2, sensor 2 downstream oxygen sensor; Walker Products Aftermarket
2018BMWM760i xDrive——6.6LV12GASDownstream RightCompatible downstream right Oxygen Sensor with bank 1 sensor 2.; Walker Products Aftermarket
2018BMWM760i xDrive——6.6LV12GASDownstream LeftDownstream left oxygen sensor for bank 2 sensor 2; Walker Products Aftermarket
2018BMWM760i xDrive——6.6LV12GASDownstream RightDownstream oxygen sensor compatible with right bank 2.; Walker Products Aftermarket
2018BMWM760i xDrive——6.6LV12GASDownstream LeftBank 2, sensor 2 downstream oxygen sensor; Walker Products Aftermarket
2018BMWM760Li xDrive——6.6LV12—Downstream RightOE Replacement
2018BMWX3——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW120i——2.0LL4—DownstreamOE Replacement
2017BMW230i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW230i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW330e——2.0LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW330i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW330i GT xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW330i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW420i——2.0LL4—DownstreamOE Replacement
2017BMW430i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW430i Gran Coupe——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW430i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW430i xDrive Gran Coupe——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW530i——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW530i xDrive——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW740e xDrive——2.0LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017BMW740Le xDrive——2.0LL4PLUG-IN HYBRID EV-GAS (PHEV)DownstreamOE Replacement
2017BMW750i——4.4LV8GASDownstream RightCompatible downstream right Oxygen Sensor with bank 1 sensor 2.; Walker Products Aftermarket
2017BMW750i——4.4LV8GASDownstream LeftDownstream left oxygen sensor for bank 2 sensor 2; Walker Products Aftermarket
2017BMW750i——4.4LV8GASDownstream RightDownstream oxygen sensor compatible with right bank 2.; Walker Products Aftermarket
2017BMW750i——4.4LV8GASDownstream LeftBank 2, sensor 2 downstream oxygen sensor; Walker Products Aftermarket
2017BMW750i xDrive——4.4LV8GASDownstream RightCompatible downstream right Oxygen Sensor with bank 1 sensor 2.; Walker Products Aftermarket
2017BMW750i xDrive——4.4LV8GASDownstream LeftDownstream left oxygen sensor for bank 2 sensor 2; Walker Products Aftermarket
2017BMW750i xDrive——4.4LV8GASDownstream RightDownstream oxygen sensor compatible with right bank 2.; Walker Products Aftermarket
2017BMW750i xDrive——4.4LV8GASDownstream LeftBank 2, sensor 2 downstream oxygen sensor; Walker Products Aftermarket
2017BMW750Li——4.4LV8—Downstream RightOE Replacement
2017BMW750Li xDrive——4.4LV8GASDownstream RightOE Replacement
2017BMWM760i xDrive——6.6LV12GASDownstream RightCompatible downstream right Oxygen Sensor with bank 1 sensor 2.; Walker Products Aftermarket
2017BMWM760i xDrive——6.6LV12GASDownstream LeftDownstream left oxygen sensor for bank 2 sensor 2; Walker Products Aftermarket
2017BMWM760i xDrive——6.6LV12GASDownstream RightDownstream oxygen sensor compatible with right bank 2.; Walker Products Aftermarket
2017BMWM760i xDrive——6.6LV12GASDownstream LeftBank 2, sensor 2 downstream oxygen sensor; Walker Products Aftermarket
2017BMWM760Li xDrive——6.6LV12GASDownstream RightOE Replacement
2016BMW330e——2.0LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016BMW330i——2.0LL4—DownstreamOE Replacement
2016BMW420i——2.0LL4—DownstreamEngine Designation : B48; OE Replacement
2016BMW420i Gran Coupe——2.0LL4—DownstreamEngine Designation : B48; OE Replacement
2016BMW750Li——4.4LV8—Downstream RightOE Replacement
2016BMW750Li xDrive——4.4LV8—Downstream RightOE Replacement
2015BMW750Li——4.4LV8—Downstream RightOE Replacement