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Bmw 645ci Problems

The BMW 645Ci was a grand touring coupe and convertible produced from 2004 to 2005, powered by a 4.4L N62 V8 producing 325 horsepower. As the first new 6 Series since 1989, the E63/E64 645Ci reestablished BMW's presence in the luxury GT segment with distinctive Chris Bangle styling. With 144 complaints and zero deaths on record, the 645Ci offered strong performance but carried complexity that required attentive maintenance.

144
Total Complaints
0
Total Recalls
3
Model Years
0
Reported Deaths
✓

Best Years

These years have the fewest reported problems.

2006

Common Problem Categories

Air Bags 32
Seat Belts 18
Electrical System 14
Seats 12
Service Brakes, Hydraulic 10

Complaints by Model Year

All Model Years

Year ↓ Complaints Recalls Crashes Fires Rating
2006 2 0 0 0 Good
2005 94 0 0 8 Below Average
2004 48 0 0 0 Average

Bmw 645ci Years to Avoid

The 2005 645Ci generated the most complaints, with owners reporting N62 engine oil leaks, active steering malfunctions, and electrical issues affecting iDrive and various comfort systems. The N62 V8's Valvetronic system required careful attention, and cooling system components frequently needed replacement.

Best Bmw 645ci Years

The 2006 650i (which replaced the 645Ci designation) offered improved software and refined systems. Among 645Ci-specific model years, late-production 2005 examples benefited from running production changes. The 650i designation with the upgraded engine is generally preferable.

Frequently Asked Questions

What is the difference between 645Ci and 650i?

The 650i replaced the 645Ci for 2006 with a revised 4.8L version of the N62 V8 producing 360 hp versus 325 hp. The 650i also received software improvements and refined electronics. The naming change reflected the displacement increase.

Is the N62 V8 reliable?

The N62 requires attentive maintenance. Common issues include Valvetronic motor failures, alternator bracket oil leaks, and cooling system component failures. Budget for valve cover gasket and oil pan gasket replacement on higher-mileage examples.

What is iDrive like in the 645Ci?

The 645Ci features first-generation iDrive, which was controversial when new. It controls many vehicle functions through a complex menu structure. Familiarity improves the experience, but it feels dated compared to modern systems.

Is the 645Ci a good used buy?

The 645Ci offers substantial presence and performance at depreciated prices. Budget for maintenance and potential repairs. A well-documented example with service records is essential for a positive ownership experience.