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Bosch Oxygen Sensor; After Catalytic Converter, Rear Manifold; OE Version, Four Wire Heated; 990mm | 15681

BMW 325i, X3, 530i, 330i, 330Ci, 525i, 325Ci, 325i Sport Wagon
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P/N: 15681 Bosch OEM
After Catalytic Converter, Rear Manifold; OE Version, Four Wire Heated; 990mm
Recommended replacement interval: 100,000 miles.
Cross References:
  • 0258005306
  • 0258005306009
  • 11787514927
  • W01331809493

Oxygen (O2) sensors are emissions control sensors that detect levels of oxygen in an engine's exhaust. When the element inside the O2 sensor heats up, oxygen flowing through the sensor causes the element to create electricity. This electrical current is sent to the engine's computer and converted to an oxygen level reading. Some O2 sensors are equipped with a heating element to speed up the oxygen-sensing process, while others rely on the engine's exhaust to heat them.

O2 sensors are one of the more commonly failed sensors in a BMW emissions control system. Continuous exposure to exhaust temperatures ranging from 300°-700° Fahrenheit over time causes the sensor element to lose its ability to create voltage, making the sensor give incorrect readings. When this happens, the engine computer operates the fuel injectors on preset fault parameters and turns the check engine light on with a fault code. If an O2 sensor behind the catalytic converter fails, the ECM may turn on the check engine light with a fault code for the catalytic converter because the faulty O2 sensor reading gives the appearance that the catalytic converter is not functioning.

Failed O2 sensors will often result in a lack of engine power that is not usually noticed but a decrease in fuel economy, that is. If your check engine light is on and your BMW is driving normally, you should still have the fault code checked, as it could very well be an O2 sensor that failed and is causing your vehicle to consume excessive fuel.

View more BMW O2 Sensors.

Bosch is the world's largest supplier of components to the automotive industry. The Bosch product line includes alternators & starters, brakes, electronic controls and sensors, fuel system parts and management, ignition system components, and steering system components. All Bosch automotive parts are either OEM (Original Equipment Manufacturer) or made to their specs as a replacement part for the OEM unit.
Left = Driver side and Right = Passenger side.
All parts are priced individually unless identified as a set or kit. "Per car" notes identify how many of a given part your car has and "Left/Right or Front/Rear" notes means the part fits the left or right side of the car. These parts are still sold individually and you'll need to select the appropriate quantity if you plan to replace more than one of this item.

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What This Bosch Oxygen Sensor Fits?

Application information below is for reference only and should not be used to determine the exact vehicle fitment. Please use the "Make Sure It Fits" vehicle selection box above to determine the exact fitment and review any application notes. If you need any help determining if this part works with your vehicle, please don't hesitate to contact us.

04-06 - 325Ci E46
03-04 - 325Ci
Downstream ~ For cylinders 4-6; Body Type: Coupe
03-03 - 325Ci
For models with production date from 3/2003.
04-05 - 325i
03-04 - 325i
Downstream ~ For cylinders 4-6
03-03 - 325i
For models with production date from 3/2003.
04-04 - 325i Sport Wagon
03-03 - 325i Sport Wagon
Downstream ~ For cylinders 4-6
03-03 - 325i Sport Wagon
For models with production date from 3/2003.
04-06 - 330Ci E46
03-03 - 330Ci
For models with production date from 3/2003.
04-05 - 330i
03-03 - 330i
For models with production date from 3/2003.
04-04 - 525i
05-05 - 525i
For models with M54 engine code only.
04-04 - 530i
05-05 - 530i
For models with M54 engine code only.
04-06 - X3 3.0i
For models with automatic transmission only.