ANSWERS: 1
  • <h4 class="dechead">On One Hand: BMW Has Specific Recommendations

    If you keep good maintenance records on your BMW, there are mileage guidelines you can follow. A good rule of thumb is to change your oxygen sensor every 60,000 miles on a BMW made before 1995, or every 100,000 miles for a BMW made in or after 1995. This is the typical amount of time it takes carbon build-up and heat to wear the sensor out.

    On the Other: Symptoms May Dictate

    If you notice that your BMW is sluggish, getting poor gas mileage or occasionally surging when it idles, it might be time to change your oxygen sensor. Most BMWs also have an oxygen sensor light that is designed to illuminate when the part is faulty, but these have been known to be unreliable.

    Bottom Line

    If you're experiencing the symptoms of a worn-out oxygen sensor, your mechanic should be able to easily diagnose the problem and tell you whether it's time to change the part. If your records indicate that it's been 60,000 or 100,000 miles--depending on your BMW model year--it's a good idea to change the sensor before you experience any problems.

    Source:

    Pelican Parts: BMW 3-Series Oxygen Sensor Replacement

    AutoHausAZ: BMW Oxygen Sensor Repairs

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