I have a 95 s500 sedan which stops running after about 20 minutes. The SRS/ASR/ABS lights are on at all times.

Any idea why this is happening? Some DIY tech friends suggested it may be the crank sensor or fuel filter. Any other ideas?

The alternator is brand new and the problem started a few days after the dealership installed the new alternator. Battery is a little low but car starts with a jump fine.

Thanks in advance.