BMW 3 Series White Smoke Exhaust — Head Gasket Failure
White smoke from the exhaust of BMW 3 Series on startup or when warm indicates coolant entering the combustion chamber from a failed head gasket. Confirm with combustion gas test in coolant reservoir. Do not drive — engine damage accelerates rapidly. Head gasket replacement costs £700-1,500 depending on engine variant.
Repair / Solution
No confirmed fixes yet. Share yours below.
⚠️ Wrong Diagnosis?
No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this BMW 3 Series 2005 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
🚗 More About This Vehicle
Help other owners by sharing your experience.
Your real-world fix helps thousands of drivers worldwide. Takes 2 minutes.