I am driving as normal and then the car begins to have problems shifting and the transmission indicator light comes on. The owners manual tell you to pull over and shift the car into park and then apply the parking brake and turn the car off and then back on. It seems to temporarily correct the problem but it still occurs on days when the air temp. Is high. I have had the car on the diagnostic a number of times with no cure. As far as I know there are no recalls on the transmission or ECU. But this could be a major problem at high speeds on the highway or in city traffic if the car stalls or locks up BMW 2001 Z3 2.5I (steptronic shifting)

- Aurora, IL, USA

The vehicle shut off, the dealer replaced the battery and alternator.

- Concord, CA, USA

All interior and exterior lights dim in brightness unexpectedly when air conditioning system cycles. Dealership has examined vehicle and informed consumer this it is an inherent problem with vehicle, and there is nothing that can be done to remedy the problem, on last visit dealer replaced alternator, consumer and dealer working out trade-in deal. Consumer states while driving, engine idle starts going up and down, and vehicle also loses power when the A/C is on, dealer stated this is normal reaction of the voltage regulator to the sudded increase in electrical load. Right side seat switch is loose and gets stuck, dealer replaced seat switch. Consumer hears a squeaking/popping noise at rear of drivers door or convertible top near drivers shoulder area.

- Salinas, CA, USA