no power to A/T [Archive] - Bimmerfest - BMW Forums

: no power to A/T

12-11-2008, 09:30 AM
Several weeks ago I replaced the radiator which included the removal of the transmission cooler which dumped some AT fluid. Once I buttoned everything up the car ran ok ok, except for a slight occassional jerk when going into drive. I assumed it was low on AT fluid and planned on filling it the next day. Before I could that, I began to loose power to the A/T and the check engine light came on. I tried to limp home and almost made it but the engine had lost so much power that I called a tow. That night I pumped about 1 1/2 quarts of AT fluid in the trany. The check engine light went out and the everyting went back to normal until today (6 days later)when the car lost power and the check engine light came on. I added 1/2 quart of dex a/t fluid. The ligt went out and everything seems to be working ok. the code is 1221, for the #2 O2 sensor - but could a bad O2 sensor cripple the car?

Is there anything else I should be looking at?

Thanks for the help - Wool

12-11-2008, 09:31 AM
It's a '95 530it wth 190K

Rodrick Msuya
12-15-2008, 05:38 AM
What type of ATF are you using? There are some fluids that wont work with these Transmissions.