Hi, I just got done with my 150K service on 95 525i.
I have this problem, the CEL comes on and off very often throwing the same code 1221 (O2 sensor). Whenever the light is OFF and I am rolling to a stop (at a light or stop sign), the car stalls.The RPM oscillates between (0 and 2K) when I going to stop and then the car stalls.
I just replaced the O2 sensor on my car by a dealer few months ago, but the light was on and the guy said something was wrong with the computer, but it should not affect the way the car ran. Now, I am little worried everytime I drive and this is the only car I have.
Could you please help me with the problem? What could be causing it?
Thanks in advance.
O2 change at John Holtz (Rochester)
150K service by Eksten's autoworks (Rochester)