Please read some of the guides and help articles listed below detailing some of the common issues you may experience.

BMW E65, E66 Battery Replacement

BMW AUX Port Modification

ZF Transmission 6HP19, 6HP26 and 6HP28 Issues

BMW ENGINE LAG PROBLEM

ABS/DSC/BRAKE Lights on?

BMW N62 Cooling System Issues

Engine Overheating?

IVM or Why Engine Runs Sluggish

White Smoke From Tailpipe?