my 2003 bmw z4 will not start and the power roof will not operate. Day one car started but battery performed progressively more sluggish with each start. Day two the engine would not even click when attempting to start it and the power roof will not operate Have replaced the battery, made no difference. All other accessories and dash illuminations are working.
car will not start and power top will not operate on 2003 BMW Z4
by stephenrichards in Summerville, SC on June 13, 2011
ANSWER by overbys on June 13, 2011
it sure sounds like you have a poor connection at the battery terminals. you will need to have this checked at a BMW specialty shop. they will have the correct software to diagnose this problem.