If your Check Engine light is constantly trying to get your attention, one possible problem could be a bad O2 sensor. If you do have a failed oxygen sensor, follow these steps to replace it.

A new oxygen sensor can cost from less than $100 on some models to $300 or more on others, but that doesn’t include labor, which can vary widely by vehicle because of where the sensors are located.

Remedy: Dealers will re-route the electrical wiring to the oxygen sensor. The manufacturer has reported that owner notification is expected to begin during December 2003. Owners may contact BMW at ...