Walker Products 350-34656 oxygen sensor for the 2019-2023 Audi A4 4-cylinder 2.0L and other vehicles measures the oxygen content of the exhaust gas to monitor the air-fuel ratio. It is built for its specific application and fitment position, and it gives the ECU the diagnostic feedback it expects.
- Narrow-band sensor with a 4-wire direct-fit design
- Coating protects the electrode surfaces from contamination and erosion by combustion residue and particulates
- Gas-permeable platinum layer on the electrodes
- Oxygen readings help fine-tune the air-fuel mixture, which supports fuel economy
- Monitors exhaust gases to help reduce pollutants
Quick facts
- Part: Walker Products 350-34656 oxygen sensor
- Fits: 2019-2023 Audi A4 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 malfunction indicator light, and newer vehicles may store a fault code for it. Before you replace the sensor, look over its wiring harness and connector for physical damage, because damage there can also shorten a sensor's life.
Fits
This downstream, narrow-band oxygen sensor is a direct-fit part for the 2019-2023 Audi A4 4-cylinder 2.0L, the 2021-2022 Audi A5 4-cylinder 2.0L, the 2019-2020 Audi A4 Allroad 4-cylinder 2.0L and other vehicles.
Specifications
Fit and size
- Position: Downstream
- Quantity per vehicle: 1
- Thread size: M18 - 1.5
- Number of wires: 4
Build and materials
- Type: Narrow-band, direct fit
- Electrodes: gas-permeable platinum layer
- Condition: New
In the box
One oxygen sensor; the car takes one at this downstream position.
Frequently Asked Questions
Is this the right oxygen sensor for a 2019-2023 Audi A4 4-cylinder 2.0L?
Yes, Walker Products 350-34656 is a downstream oxygen sensor listed for the 2019-2023 Audi A4 4-cylinder 2.0L. For a different car, look up its year and engine in the "Vehicles it fits" section.
Is this Walker Products oxygen sensor narrow-band or wide-band?
It is narrow-band. Walker Products 350-34656 has a 4-wire direct-fit design and an M18 - 1.5 thread.
What protects the electrodes on this oxygen sensor?
A coating protects the electrode surfaces from contamination and erosion by combustion residue and particulates in the exhaust gas. The electrodes are made of a gas-permeable platinum layer.
Can a bad downstream oxygen sensor make the engine run poorly?
It can, and higher fuel consumption, more exhaust emissions or a lit malfunction indicator light are other signs. A shop can read the fault codes the ECU stores.
Is Walker Products 350-34656 sold as a single oxygen sensor?
Yes, this listing is one downstream oxygen sensor, which is the quantity the fitment calls for on each car.
