Walker 350-341118 Oxygen Sensor - Downstream or Upstream
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Walker
 OE Replacement

Walker 350-341118 Oxygen Sensor - Downstream or Upstream

Brand Walker 350-341118
Position Downstream and Upstream
Heated Yes
Wiring Harness Length 425
Wire Gauge Measurement 20.00
Sensor Type Narrow-band
Terminal Type Spade
Universal Or Specific Fit Specific
Wire Quantity 4
Grade Type Standard replacement
Connector Shape Square
Terminal Quantity 4
Connector Gender Male
Terminal Gender Male
Wrench Size 22
Thread Size M18 - 1.5
Overall Length 458
Mounting Type Threaded
Product line OE Replacement
Fits Mazda · 21 vehicles

OE replacement. Standard replacement oxygen sensor engineered for specific applications.

Heated narrow-band design. Provides the diagnostic feedback required by the ECU.

Threaded mounting. Square connector and 4-wire setup for a straightforward install.

$77.76Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Step 2 — Quantity
Order total $77.76
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 OE Replacement Oxygen Sensor 350-341118

Walker OE Replacement oxygen sensor 350-341118 is a specific-fit, heated narrow-band sensor built for direct application coverage on select Mazda models. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring, making it a practical choice for Mazda MX-5 Miata and Mazda CX-3 oxygen sensor replacement service.

Key Features

  • Heated narrow-band oxygen sensor for OE-style signal response
  • Specific-fit design for the listed Mazda applications
  • 4-wire configuration with square connector and male terminals
  • Threaded mounting with M18 x 1.5 thread size
  • Overall length: 458 mm; wiring harness length: 425 mm
  • 22 mm wrench size for service access
  • Standard replacement grade from Walker OE Replacement

Product Details

Walker Products develops engine management and oxygen/air-fuel sensors as OE replacement parts for vehicle-specific applications. Part number 350-341118 is designed for downstream and upstream positions where listed, including Mazda MX-5 Miata downstream applications and Mazda CX-3 upstream coverage. For drivers searching for a Mazda MX-5 Miata downstream oxygen sensor or a Mazda CX-3 upstream O2 sensor, this part number 350-341118 provides the correct fitment format and sensor style for the specified vehicles.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

  • Check engine light related to oxygen sensor performance
  • Poor fuel economy caused by incorrect exhaust feedback
  • Rough engine operation from inaccurate air-fuel monitoring
  • Elevated exhaust emissions from a failing sensor
  • Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Verify the sensor position before ordering, since fitment varies by year, model, and location. Confirm the connector shape, wire count, thread size, and harness length against the original sensor on the vehicle. Inspect the sensor wiring, connector, and nearby harness for heat damage or physical wear before installation, as those issues can shorten sensor life and affect ECU feedback.

  • Fits 2022-2025 Mazda MX-5 Miata, downstream
  • Fits 2023 Mazda 2, N/A
  • Fits 2023 Mazda CX-3, N/A
  • Fits 2023 Mazda MX-5, N/A
  • Fits 2020-2022 Mazda 2, downstream
  • Fits 2022 Mazda CX-3, upstream
  • Fits 2019-2022 Mazda MX-5, downstream
  • Fits 2019-2021 Mazda CX-3, downstream; B1S2
  • Fits 2019-2021 Mazda MX-5 Miata, downstream; B1S2

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an ISO 9001 / TS 16949 certified company. The OE Replacement line is built around application-specific fitment and diagnostic feedback requirements for modern ECU-controlled vehicles.

Related reading

This part fits 21 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersFuel TypePositionNotes
2025MazdaMX-5 Miata2.0LL4—DownstreamOE Replacement
2024MazdaMX-5 Miata2.0LL4—DownstreamOE Replacement
2023Mazda21.5LL4—N/AOE Replacement
2023MazdaCX-32.0LL4—N/AOE Replacement
2023MazdaMX-52.0LL4—N/AOE Replacement
2023MazdaMX-5 Miata2.0LL4—DownstreamOE Replacement
2022Mazda21.5LL4—DownstreamOE Replacement
2022MazdaCX-32.0LL4—UpstreamOE Replacement
2022MazdaMX-52.0LL4—DownstreamOE Replacement
2022MazdaMX-5 Miata2.0LL4—DownstreamOE Replacement
2021Mazda21.5LL4—DownstreamOE Replacement
2021MazdaCX-32.0LL4GASDownstreamB1S2; OE Replacement
2021MazdaMX-52.0LL4—DownstreamOE Replacement
2021MazdaMX-5 Miata2.0LL4GASDownstreamB1S2; OE Replacement
2020Mazda21.5LL4—DownstreamOE Replacement
2020MazdaCX-32.0LL4GASDownstreamB1S2; OE Replacement
2020MazdaMX-52.0LL4—DownstreamOE Replacement
2020MazdaMX-5 Miata2.0LL4GASDownstreamB1S2; OE Replacement
2019MazdaCX-32.0LL4GASDownstreamB1S2; OE Replacement
2019MazdaMX-52.0LL4—DownstreamOE Replacement
2019MazdaMX-5 Miata2.0LL4GASDownstreamB1S2; OE Replacement