Walker Products 350-34648 oxygen sensor for the 2003-2006 BMW 325Ci 6-cylinder 2.5L and other vehicles monitors the oxygen in the exhaust. Each Walker Products oxygen sensor part number is made for a specific application and fitment position, so it gives the ECU the diagnostic feedback it expects.
- Monitors exhaust gases to help reduce pollutants
- Electrodes made of a gas-permeable platinum layer
- Reads the oxygen content of the exhaust gas to track the air-fuel ratio for combustion efficiency
- Measures oxygen levels so the air-fuel mixture can be fine-tuned for fuel economy
- Electrode coating resists contamination and erosion from combustion residue and exhaust particulates
Quick facts
- Part: Walker Products 350-34648 oxygen sensor
- Fits: 2003-2006 BMW 325Ci 6-cylinder 2.5L and other vehicles
- Position: Downstream
- Condition: New
A failing oxygen sensor can show up as a rough-running engine, higher fuel use, more exhaust emissions or a lit malfunction indicator light, and newer vehicles may store a fault code for it. Damage to the sensor's wiring harness or connector can bring on these symptoms too, so trace the cause before you buy a sensor.
Fits
The 2003-2006 BMW 330Ci 6-cylinder 3.0L and the 2004-2006 BMW X3 6-cylinder 3.0L are among the vehicles that take this downstream sensor as a direct-fit replacement. If your BMW is not named here, enter its year, model and engine in the "Vehicles it fits" section to see whether this sensor is matched to it.
Specifications
Fit and size
- Position: Downstream
- Quantity per vehicle: 1
- Thread size: M18 - 1.5
- Wires: 4
Build and materials
- Type: Narrow-band
- Electrodes: gas-permeable platinum layer
- Condition: New
In the box
One oxygen sensor. The fitment lists one per vehicle.
Frequently Asked Questions
Is this the right BMW X3 oxygen sensor for the 2004-2006 X3 6-cylinder 3.0L?
Yes. Walker Products 350-34648 is listed for the 2004-2006 BMW X3 6-cylinder 3.0L, with one sensor per vehicle in the downstream position.
Does the 350-34648 work as a BMW 330Ci oxygen sensor for the 2003-2006 6-cylinder 3.0L?
Yes. The 2003-2006 BMW 330Ci 6-cylinder 3.0L is on its fitment list, and the sensor goes in the downstream position, one per vehicle.
Is this Walker Products oxygen sensor narrow-band or wideband?
It is a narrow-band sensor. Walker Products 350-34648 has four wires and an M18 - 1.5 thread.
How can I tell if this downstream oxygen sensor is going bad?
Watch for a rough-running engine, higher fuel use or a lit malfunction indicator light. With the engine off and cool, you can also look over the sensor, wiring harness and connector for physical damage.
Is the 350-34648 an upstream or downstream sensor?
Downstream. This listing is one sensor, and the fitment lists one per vehicle.
