Walker Products 250-25016 oxygen sensor for the 2003-2006 BMW 325Ci 6-cylinder 2.5L and other vehicles measures the oxygen content of the exhaust gas. This Walker Products oxygen sensor is a 5-W wide-band unit that tracks the air-fuel ratio for combustion efficiency.
- Electrodes coated with a gas-permeable platinum layer
- Coating protects the electrode surfaces from contamination and erosion by combustion residue and particulates
- Monitors exhaust gases to help reduce pollutants
- Measures oxygen levels so the air-fuel mixture can be fine-tuned, which helps fuel economy
- Gives the ECU the diagnostic feedback it requires
Quick facts
- Part: Walker Products 250-25016 oxygen sensor
- Fits: 2003-2006 BMW 325Ci 6-cylinder 2.5L and other vehicles
- Position: Upstream
- Condition: New
A failing sensor can show up as the engine running poorly, higher fuel consumption or a lit malfunction indicator light. Those signs have other possible sources, so with the engine off and cool, look the sensor, wiring harness and connector over for physical damage before you replace it.
Fits
This upstream oxygen sensor is an OE-replacement for the 2003-2006 BMW 330Ci 6-cylinder 3.0L and the 2004-2006 BMW X3 6-cylinder 3.0L, and it is made for its specific application and position. For a BMW not named here, look up your year, model and engine in the "Vehicles it fits" section.
Specifications
Fit and size
- Position: Upstream
- Quantity per vehicle: 1
- Engines: L6-2.5L, L6-3.0L
Build and materials
- Type: 5-W wide-band oxygen sensor
- Electrodes: gas-permeable platinum layer
- Condition: New
In the box
One oxygen sensor. This listing holds a single sensor, and the 2003-2006 BMW 330Ci 6-cylinder 3.0L takes one.
Product information is for general reference and may contain errors. See our Disclaimer.
Frequently Asked Questions
Is this the right oxygen sensor for a 2004-2006 BMW X3 6-cylinder 3.0L?
Yes. Walker Products 250-25016 is listed for the 2004-2006 BMW X3 6-cylinder 3.0L (L6-3.0L) as an upstream sensor, with a quantity of one per vehicle.
Will the Walker Products 250-25016 fit a 2003-2006 BMW 330Ci 6-cylinder 3.0L?
Yes. Walker Products 250-25016 is listed for the 2003-2006 BMW 330Ci 6-cylinder 3.0L (L6-3.0L), which takes one sensor.
Is this wide-band oxygen sensor an upstream or downstream unit?
Upstream. This sensor is a 5-W wide-band oxygen sensor, sold as one sensor per listing.
What are the electrodes on this oxygen sensor made of?
The electrodes use a gas-permeable platinum layer. A coating guards the electrode surfaces against contamination and erosion from combustion residue and particulates in the exhaust.
Will a failing oxygen sensor set a fault code?
It can. Newer vehicles store fault codes in the ECU, and some relate to the affected sensor and its associated systems. A shop can read them with the right equipment.
