Walker Products 350-34673 oxygen sensor for the 2017-2021 BMW M240i 6-cylinder 3.0L and other vehicles measures oxygen in the exhaust gas on the downstream side. The amount of oxygen it reads shows how efficiently the fuel is burning.
- Narrow-band sensor with a 4-wire connection
- Electrodes made of a gas-permeable platinum layer
- Coating protects the electrode surfaces from combustion residue and particulates in the exhaust gases
- Monitors exhaust gases and reduces pollutants for a cleaner environment
- Determines the oxygen content of the exhaust gas to monitor the air-fuel ratio for combustion efficiency
Quick facts
- Part: Walker Products 350-34673 oxygen sensor
- Fits: 2017-2021 BMW M240i 6-cylinder 3.0L and other vehicles
- Position: Downstream
Rough running, higher fuel use or a lit malfunction indicator light can mean this sensor is worn, though the wiring harness or the connector can be behind them too. With the engine off, look both over for physical damage before you replace the sensor.
Fits
The 2017-2021 BMW M240i 6-cylinder 3.0L, the 2017-2021 BMW M240i xDrive 6-cylinder 3.0L and the 2018-2021 BMW X3 6-cylinder 3.0L take this sensor, and it fits many other vehicles as well. If your car is not named here, look it up in the "Vehicles it fits" section to see whether it is covered.
Specifications
Fit and size
- Position: downstream
- Quantity per vehicle: 1
- Thread size: M18 - 1.5
- Number of wires: 4
Build and materials
- Sensor type: narrow-band
- Electrodes: gas-permeable platinum layer
- Electrode coating: protects against contamination and erosion
In the box
This listing is one oxygen sensor, and these vehicles take one at the downstream position.
Frequently Asked Questions
Is this the oxygen sensor for a 2018-2021 BMW X3 6-cylinder 3.0L?
Yes. Walker Products 350-34673 fits the 2018-2021 BMW X3 6-cylinder 3.0L at the downstream position, and the vehicle takes one.
Does this oxygen sensor go upstream or downstream?
Downstream. Walker Products 350-34673 is a downstream-position sensor, and the vehicles it fits take one.
Is this Walker Products oxygen sensor narrow-band or wideband?
Narrow-band. This sensor has 4 wires, an M18 - 1.5 thread and electrodes made of a gas-permeable platinum layer.
What can a worn downstream oxygen sensor do to the engine?
The engine can run poorly, fuel consumption and exhaust emissions can rise, or the malfunction indicator light can come on. Newer vehicles may also store a fault code in the ECU.
What does the coating on this oxygen sensor protect?
The coating keeps combustion residue and particulates in the exhaust gases from contaminating or eroding the electrode surfaces of Walker Products 350-34673.
