Thought I would pass along some good news. I was having a lot of trouble finding a local source for an exact replacement for the oxygen sensor. Tried the internet and found a company in North Carolina named German Auto Supply that carried it at a much better price than a BMW dealer. The Bosch number for the sensor is 0 258 003 475. Got the sensor two days after I placed the order. No connection to GAS other than as a satisfied customer.