Walker Products 350-34437 oxygen sensor for the 2003-2006 BMW Z4 6-cylinder 2.5L or 3.0L and other vehicles measures the oxygen in the exhaust gas to gauge combustion efficiency. This Walker Products oxygen sensor is made for its specific application and fitment position, and it gives the ECU the diagnostic feedback it needs.
- Narrow-band design with four wires
- Monitors exhaust gases and reduces pollutants for a cleaner environment
- Electrodes made of a gas-permeable platinum layer
- Measures oxygen levels to fine-tune the air-fuel mixture and improve fuel economy
- Coating protects the electrode surfaces from contamination and erosion by combustion residue and exhaust particulates
Quick facts
- Part: Walker Products 350-34437 oxygen sensor
- Fits: 2003-2006 BMW Z4 6-cylinder 2.5L or 3.0L and other vehicles
- Position: Downstream, downstream left, downstream right
- Condition: New
A failing sensor can show up as rough running, higher fuel consumption, more exhaust emissions or a lit malfunction indicator light. Before you replace the sensor, rule out damage to the wiring harness and connector, since both should be looked over for physical damage too. This listing is a single sensor, and the fitment counts one per position.
Fits
The vehicles it fits include the 2004-2006 BMW X3 6-cylinder 2.5L or 3.0L and the 2001-2006 BMW X5 6-cylinder 3.0L, in addition to the car named at the top. Open the "Vehicles it fits" section to check your exact model and engine.
Specifications
Fit and size
- Position: downstream, downstream left, downstream right
- Quantity per application: 1
- Fit type: direct fit
Build and materials
- Type: narrow-band oxygen sensor
- Wires: 4
- Electrodes: gas-permeable platinum layer
- Condition: New
Interchange: CTK-OSBW4003
Product information is for general reference and may contain errors. See our Disclaimer.
Frequently Asked Questions
Is the Walker Products 350-34437 a BMW X3 oxygen sensor for a 2004-2006 model with the 6-cylinder 2.5L or 3.0L?
Yes. Walker Products 350-34437 is listed for the 2004-2006 BMW X3 with the 6-cylinder 2.5L or 3.0L engine. Its catalog position is downstream, with downstream left and downstream right also listed.
Is this a BMW Z4 oxygen sensor for the 2003-2006 Z4 with the 6-cylinder 2.5L or 3.0L?
Yes. Walker Products 350-34437 is listed for the 2003-2006 BMW Z4 with the 6-cylinder 2.5L or 3.0L engine, and the fitment counts one sensor per position.
Is this oxygen sensor narrow-band or wideband, and how many wires does it have?
This oxygen sensor is a narrow-band type with four wires. It measures the oxygen content of the exhaust gas to monitor the air-fuel ratio.
What does the coating on this Walker Products oxygen sensor protect against?
The coating helps prevent contamination and erosion of the electrode surfaces by combustion residue and particulates in the exhaust gases. The electrodes use a gas-permeable platinum layer.
Does CTK-OSBW4003 interchange with Walker Products 350-34437?
Yes. CTK-OSBW4003 is listed as an interchange number for Walker Products 350-34437, so you can use it to cross-reference this oxygen sensor.
