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2004 BMW 6 Series Convertible 645Ci Convertible

The 2004 BMW 6 Series Convertible 645Ci Convertible is a 325-hp 4.4-liter V8 convertible with a 6-speed manual and rear-wheel drive. It starts at $76,995 MSRP and is rated at 18 mpg combined.

It makes 325 horsepower at 6,100 rpm and 330 lb-ft of torque at 3600 rpm. EPA fuel-economy estimates are 15 mpg city and 23 mpg highway (18 mpg combined).

The 6 Series Convertible measures 190.2 inches long on a 109.4-inch wheelbase and has a curb weight of 3,781 lb.

Spec Value
Vehicle
Body TypeConvertible
PowertrainGas
Price
MSRP$76,995 ($132,469 *)
Engine
Engine Type4.4-liter DOHC 32-valve V8
Displacement4.4 L
Horsepower325 hp @ 6,100 rpm
Torque330 lb-ft @ 3600 rpm
ValvetrainDOHC, 32-valve
Drivetrain
Drive TypeRWD
Transmission
Transmission6-speed manual
Fuel Economy
City15 MPG
Highway23 MPG
Combined18 MPG
Tank Capacity18 gal
Suspension
Front SuspensionElectronically controlled
Tires & Wheels
Wheels Front18"
Wheels Rear18"
Tires Front245/45R18
Tires Rear245/45R18
Dimensions & Weight
Length190.2 in
Width73 in
Height54.1 in
Wheelbase109.4 in
Curb Weight3,781 lbs
Interior
Headroom Front37.3 in
Headroom Rear35.5 in
Legroom Front42 in
Legroom Rear28.8 in
Shoulder Room Front56.4 in
Shoulder Room Rear49.4 in
* Amount adjusted for inflation to 2026 dollars

Safety & Recalls

NCAP safety ratings

Tested, but no star ratings were published (2004 BMW 6 Series 2-DR. w/SAB).

Recalls

5 recalls on file with NHTSA for the 2004 BMW 6 SERIES. Not every recall applies to every trim or VIN — check yours at nhtsa.gov/recalls.

Aug 10, 2012 · ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN

This recall involves aftermarket parts sold by Valeo. Valeo is recalling certain engine cooling fans, part numbers 696121, 696273, and 696275, used as service replacement parts for model year 2008-2011 BMW 1-Series, 2006-2011 BMW 3-Series, 2000-2009 BMW 5-Series, 2004-2005 BMW 6-Series, and 2006-2007 BMW 7-Series vehicles. A metal-oxide semiconductor may overheat due to insufficient screwing of the semiconductor on the aluminum heat sink. This primary failure could cause adjacent components on the fan assembly motor circuit board to overheat and short.

Consequence: This condition could cause the fan motor to become inoperative, or cause the motor circuit board in the assembly to overheat, potentially leading to a fire in the engine compartment.

Remedy: Valeo will notify owners and replace the fans free of charge. The safety recall began on August 22, 2012. This recall is being conducted by Valeo, not by BMW. For further information, owners may contact Valeo at 1-888-718-2536.

NHTSA campaign 12E029000

Mar 26, 2012 · ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES

BMW IS RECALLING CERTAIN MODEL YEAR 2004-2010 5-SERIES, MODEL YEAR 2004-2010 6-SERIES, MODEL YEAR 2006-2010 M5, AND MODEL YEAR 2007-2010 M6 VEHICLES. THE INSULATED BULKHEAD CONNECTOR FOR THE POSITIVE BATTERY CABLE MAY HAVE BEEN INCORRECTLY ATTACHED TO THE TRUNK FLOOR PANEL, WHICH CAN LEAD TO A LOOSENING OF THE BOLT CONNECTION. AS IT LOOSENS, AN INCREASE IN ELECTRICAL RESISTANCE AT THIS CABLE CONNECTION IS POSSIBLE AND COULD CAUSE THE CABLE CONNECTION TO OVERHEAT.

Consequence: OVERHEATING COULD LEAD TO A FIRE, EVEN WHILE THE VEHICLE IS NOT IN USE. AS A PRECAUTION, OWNERS ARE ADVISED TO PARK OUTSIDE UNTIL THE REMEDY HAS BEEN MADE.

Remedy: BMW WILL NOTIFY OWNERS, AND DEALERS WILL INSPECT AND SECURE THE BATTERY BOLT CABLE CONNECTION AS NECESSARY, FREE OF CHARGE. THE SAFETY RECALL BEGAN ON APRIL 30, 2012. OWNERS MAY CONTACT BMW CUSTOMER RELATIONS AND SERVICES AT 1-800-525-7417.

NHTSA campaign 12V126000

Oct 1, 2010 · SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM

BMW IS RECALLING CERTAIN MODEL YEAR 2004-2010 5-SERIES, 6-SERIES, AND MODEL YEAR 2002-2008 7-SERIES VEHICLES. A CHECK VALVE OF THE BRAKE VACUUM PUMP MAY LEAK A SMALL AMOUNT OF LUBRICATING OIL. OVER TIME THIS COULD RESULT IN CONTAMINATION OF THE BRAKE BOOSTER.

Consequence: POWER ASSIST BRAKING PERFORMANCE COULD BE ADVERSELY AFFECTED. IN EXTREME CASES THERE COULD BE A COMPLETE LOSS OF POWER ASSIST BRAKING. AN UNEXPECTED REDUCTION OR LOSS IN POWER BRAKING ASSIST MAY INCREASE THE RISK OF A CRASH.

Remedy: BMW WILL NOTIFY OWNERS AND DEALERS WILL REPAIR THE VEHICLES FREE OF CHARGE. THE SAFETY RECALL BEGAN ON NOVEMBER 24, 2010. OWNERS MAY CONTACT BMW AT 1-800-525-7417.

NHTSA campaign 10V446000

Jul 14, 2004 · POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

ON CERTAIN PASSENGER VEHICLES EQUIPPED WITH 8 AND 12 CYLINDER ENGINES, THE DIGITAL ENGINE MANAGEMENT CONTROL (EMC) UNITS WERE NOT PRODUCED ACCORDING TO SPECIFICATIONS.

Consequence: AS A RESULT, ENGINE STALLING WILL OCCUR AFTER A SHORT PERIOD OF OPERATION. THE VEHICLE MAY NOT BE ABLE TO RESTART. ALSO, A LOSS OF POWER STEERING AND, AFTER REPEATED ACTUATION OF THE BRAKE PEDAL, A LOSS OF BRAKE POWER ASSIST WILL OCCUR. THESE CONDITIONS COULD RESULT IN A VEHICLE CRASH.

Remedy: DEALERS WILL INSTALL A NEW DIGITAL ENGINE MANAGEMENT CONTROL UNIT. THE RECALL BEGAN ON JULY 16, 2004. OWNERS SHOULD CONTACT BMW AT 1-800-831-1117.

NHTSA campaign 04V344000

Jun 23, 2004 · FUEL SYSTEM, GASOLINE

ON CERTAIN PASSENGER VEHICLES EQUIPPED WITH 8-CYLINDER ENGINES, A CIRCULAR RETENTION CLIP AT THE QUICK-RELEASE COUPLING ALONG THE FUEL SUPPLY LINE WAS INADVERTENTLY NOT INSTALLED.

Consequence: IN THE EVENT OF A SEVERE FRONTAL CRASH, THE QUICK-RELEASE COUPLING COULD SEPARATE CAUSING FUEL LEAKAGE. FUEL LEAKAGE, IN THE PRESENCE OF AN IGNITION SOURCE, COULD RESULT IN A FIRE.

Remedy: DEALERS WILL INSTALL A CIRCULAR RETENTION CLIP AT THE QUICK-RELEASE COUPLING ALONG THE FUEL SUPPLY LINE. THE RECALL BEGAN ON JULY 5, 2004. OWNERS SHOULD CONTACT BMW AT 1-800-831-1117.

NHTSA campaign 04V303000

14 owner complaints to NHTSA for the 2004 BMW 6 SERIES

Owner Complaints

14 owner complaints filed with NHTSA for the 2004 BMW 6 SERIES. See all on nhtsa.gov

Most-cited areas
Air Bags5
Electrical System4
Seat Belts4
Engine And Engine Cooling2
Power Train2
Seats2
A complaint can cite more than one area.
Most recent complaints
Mar 26, 2024 · Wheels
“My Bmw got impounded illegally from my location where I rent commercial space and there is no signs saying car wheel be parked there at 12 at night this was an illegal tow by tow guys 3823 losse rd…”
Sep 6, 2021 · Electrical System, Seat Belts, Engine
“The idrive system in my car continues to cut on and off, this eventually caused my car to shut off on me two times while in traffic with no warning or indication of the shut off. The sensor alert…”
Aug 6, 2018 · Seats, Air Bags
“PASSENGER SEAT OC3 OCCUPANCY MAT NOT WORKING-IT SHOWS A FAULT CODE- I TOOK IT TO BIRMINGHAM BMW AND WAS TOLD I HAVE TO GET A NEW BMW BATTERY AND BATTERY CABLE.THEY CHARGED ME $ 120 TO DIAGNOSE THIS…”
May 3, 2017 · Steering, Seat Belts, Electronic Stability Control (Esc)
“ACTIVE STEERING MALFUNCTION, AIRBAGS LIGHTS, STABLE CONTROLL STEERING WHEEL IS COCKED ABOUT HALF TURN TO DRIVE STREIGHT.”
Mar 27, 2015 · Air Bags
“I HAVE WARNING LIGHT WHEN I TURN ON MY CAR THAT THE PASSENGER RESTRAINT AND AIRBAG IS INACTIVE AND THIS SHOULD BE A RECALL... THIS IS SAFETY NOT A LUXURY OPTION... BMW ADVISED ME THAT IT WAS SOME…”

Complaints are unverified reports submitted to NHTSA by owners. They cover the whole model year, not a specific trim, and a count alone doesn't show how common a problem is.

Source: US National Highway Traffic Safety Administration (nhtsa.gov), matched as 2004 BMW 6 SERIES. US-market vehicles only; data cached for up to 7 days.

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