Walker 350-34693 Oxygen Sensor - Downstream
OE Quality 60-Day Returns
Walker
 Walker Products Aftermarket

Walker 350-34693 Oxygen Sensor - Downstream

Brand Walker 350-34693
Position Downstream
Connector Gender Female
Connector Shape Radiused Polygon
Mounting Type Threaded
Overall Length 28.66
Sensor Type Heated
Thread Diameter 18.0
Universal Or Specific Fit Specific
Wire Gauge Measurement 20
Wire Quantity 4
Wiring Harness Length 25.12
Product line Walker Products Aftermarket
Fits Mazda · 53 vehicles

OE replacement. Engineered as an original-equipment-style oxygen sensor.

Heated sensor. Provides the diagnostic feedback the ECU needs.

Threaded mount. Installs with a secure, direct-fit connection.

$52.01Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.

Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $52.01
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Oxygen Sensor options

Walker Products 350-34693 Oxygen Sensor

Walker Products 350-34693 is a heated downstream oxygen sensor built as an OE-style replacement for specific Mazda applications. It is engineered for the correct fitment position and ECU feedback on vehicles that rely on precise exhaust monitoring.

For Mazda CX-5, Mazda CX-9, Mazda 6, Mazda 3, and Mazda 3 Sport applications, this downstream sensor helps maintain accurate emissions system data and supports proper engine management diagnostics.

Key Features

  • Heated oxygen sensor for downstream placement
  • Specific-fit design for confirmed Mazda applications
  • 4-wire configuration with female connector
  • Threaded mounting with 18.0 mm thread diameter
  • Wiring harness length: 25.12 in.
  • Overall length: 28.66 in.
  • Radiused polygon connector shape
  • Walker Products Aftermarket line for engine management and oxygen/air-fuel sensors

Detailed Description

Walker Products 350-34693 is designed for downstream oxygen sensor service where the ECU depends on accurate exhaust feedback after the catalytic converter. The heated sensor design helps the unit reach operating temperature efficiently, while the specific-fit construction supports correct placement on the vehicle. This part is listed for 2022-2025 Mazda CX-5 downstream, 2022-2023 Mazda CX-9 downstream, 2014-2021 Mazda 6 downstream, 2019-2021 Mazda CX-5 downstream, 2013-2016 Mazda CX-5 downstream, 2021 Mazda CX-9 downstream, 2014-2018 Mazda 3 downstream, and 2014-2015 Mazda 3 Sport downstream. Part number 350-34693 is an OE replacement choice for drivers servicing Mazda emissions control systems.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered for application-specific fitment and diagnostic feedback. The brand’s product line is built around replacement parts that match the required sensor position and connector style for the vehicle.

What It Helps Address

  • Check engine light related to downstream oxygen sensor performance
  • Poor fuel economy caused by inaccurate exhaust feedback
  • Elevated exhaust emissions from a failing sensor
  • Rough engine operation tied to sensor signal issues
  • Fault codes stored in the ECU for affected sensor circuits

Installation Notes and Tips

Confirm the vehicle’s sensor position before ordering, since this part is for downstream applications only. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation. Verify thread size, connector shape, and wire count against the original sensor to ensure proper replacement on the Mazda CX-5, Mazda CX-9, Mazda 6, Mazda 3, or Mazda 3 Sport application.

Quality Assurance

Walker Products is an automotive ISO 9001/TS 16949 certified company with a long history in engine management components. Part number 350-34693 is manufactured for specific application fitment and diagnostic system feedback requirements.

Related reading

This part fits 53 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelLitersCylindersFuel TypePositionNotes
2024MazdaCX-5—2.5LL4—DownstreamOE Replacement
2023MazdaCX-5—2.5LL4—DownstreamOE Replacement
2023MazdaCX-9—2.5LL4—DownstreamOE Replacement
2022MazdaCX-5—2.5LL4—DownstreamOE Replacement
2022MazdaCX-9—2.5LL4—DownstreamOE Replacement
2021Mazda6—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2021MazdaCX-5—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2021MazdaCX-9—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2020Mazda6—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2020MazdaCX-5—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019Mazda6—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019MazdaCX-5—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018Mazda3Touring2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018Mazda3Grand Touring2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018Mazda3Touring2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018Mazda3Sport2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018Mazda6—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017Mazda3Touring2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017Mazda3Grand Touring2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017Mazda3—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017Mazda3Touring2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017Mazda3Sport2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017Mazda3—2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017Mazda6—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016Mazda3s Touring2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016Mazda3s Grand Touring2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016Mazda3—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016Mazda3i Grand Touring2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016Mazda3I Touring2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016Mazda3I Sport2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016Mazda3—2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016Mazda6—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016MazdaCX-5—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016MazdaCX-5—2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015Mazda3s Touring2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015Mazda3s Grand Touring2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015Mazda3—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015Mazda3i SV2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015Mazda3i Grand Touring2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015Mazda3I Touring2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015Mazda3I Sport2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015Mazda3—2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015Mazda3 Sport—2.0LL4—DownstreamOE Replacement
2015Mazda6—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015MazdaCX-5—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015MazdaCX-5Sport2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014Mazda3—2.5LL4—DownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014Mazda3—2.0LL4—DownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014Mazda3 Sport—2.5LL4—DownstreamOE Replacement
2014Mazda6—2.5LL4—DownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014MazdaCX-5—2.5LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014MazdaCX-5—2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2013MazdaCX-5—2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket