Walker Products 350-34133 oxygen sensor for the 2019-2022 Mazda 3 4-cylinder 2.5L, the 2021-2022 3 4-cylinder 2.0L and other vehicles measures the oxygen in the exhaust gas to show combustion efficiency. It is built for its specific application and fitment position, so the ECU gets the diagnostic feedback the system requires.
- Narrow-band sensor with 4 wires
- Coating protects the electrode surfaces from contamination and erosion by combustion residue and particulates in the exhaust gases
- Measures oxygen levels to help fine-tune the air-fuel ratio for fuel economy
- Electrodes made of a gas-permeable platinum layer
- Monitors exhaust gases to help reduce pollutants
Quick facts
- Part: Walker Products 350-34133 oxygen sensor
- Fits: the 2019-2022 Mazda 3 4-cylinder 2.5L, the 2021-2022 3 4-cylinder 2.0L and other vehicles
- Position: Downstream
- Condition: New
A failing sensor can show up as rough running, higher fuel consumption, more exhaust emissions or a lit check engine light. Those signs alone don't prove the sensor is at fault, because a vacuum leak can look much the same. The sensor, wiring harness and connector should also be checked for physical damage. This listing is one sensor, and these engines take one in the downstream position.
Fits
The vehicles it fits include the 2018-2021 Mazda 6 4-cylinder 2.5L, along with the Mazda 3 engines named above, and it works as a Mazda CX-5 oxygen sensor for the 2017-2025 4-cylinder 2.5L and the 2018-2019 4-cylinder 2.0L. If your Mazda isn't one of these, enter its year and engine in the "Vehicles it fits" section.
Specifications
Fit and size
- Position: Downstream
- Quantity per vehicle: 1
- Wires: 4
Build and materials
- Type: Narrow-band, direct fit
- Electrodes: gas-permeable platinum layer
- Condition: New
Product information is for general reference and may contain errors. See our Disclaimer.
Frequently Asked Questions
Is this the Mazda 6 oxygen sensor for a 2018-2021 4-cylinder 2.5L?
Yes. Walker Products 350-34133 fits the 2018-2021 Mazda 6 4-cylinder 2.5L as a downstream sensor.
Is this the Mazda 3 oxygen sensor replacement for a 2019-2022 4-cylinder 2.5L or a 2021-2022 4-cylinder 2.0L?
Yes. Walker Products 350-34133 is a downstream replacement for both the 2019-2022 Mazda 3 4-cylinder 2.5L and the 2021-2022 Mazda 3 4-cylinder 2.0L.
Is this Walker Products oxygen sensor upstream or downstream?
Downstream. It is a narrow-band sensor with 4 wires, and the application takes one.
What can a failing downstream oxygen sensor look like?
Poor engine running, higher fuel consumption, more exhaust emissions or a lit check engine light can all come with a failing sensor. Newer vehicles store fault codes in the ECU, and a shop can read them.
What protects the electrodes inside this oxygen sensor?
A coating shields the electrode surfaces from contamination and erosion caused by combustion residue and particulates in the exhaust. The electrodes themselves are a gas-permeable platinum layer.
