[KevinH1990]

I had a CEL again. I read the code and it is showing Bank 2 Sensor 1 as aging. Based on the date of my first post in this thread, it looks like 5 months since the last CEL. I cleared the code again and I will see how long it takes to return.

According the article Mike Focke linked, it appears that 100,000 miles is the average life expectancy of an O2 sensor. The car has 133,000 miles on the odometer and I've driven 103,000 of those miles. Even if the previous owner changed the sensors (which was not documented in the pile of receipts he gave me) all but one of my sensors has seen 100,000 miles of use.

I don't like to replace parts for the sake of replacing parts, but if the code returns in a few weeks, it may be time to start shopping for an O2 sensor.