Original BMW Turn Indicator Bulb Socket, Headlight Unit, for BMW E39 5 Series and M5 (2000–2003)

The Original BMW headlight turn signal bulb socket holds the front turn indicator bulb and carries current to it on the E39 5 Series 525i, 528i, 530i, 540i, and M5 built from 2000 to 2003. BMW calls this part the bulb socket for the turn indicator. It is sold individually, one socket per order. BMW production of this number began in September 2000. It supersedes the earlier part 63 12 8 361 002. A turn signal socket is the small electrical holder that locks the bulb in place and gives it a feed and a ground. If the socket loses contact, a good bulb can act like a failed one.

Original BMW Parts carry a 24-month parts warranty.

BMW rates this socket as not interchangeable backward with 63 12 8 361 002. A car that left the factory with the earlier number may not accept this one as a direct swap. The same socket serves the E39 5 Series models in the fitment below, across four engine families: the six-cylinder M52 and M54, the M62 V8 in the 540i, and the S62 V8 in the M5. One part number covers every trim from the 525i to the M5, so there is no version to choose for each engine.

Technical Details

• Manufacturer: BMW (genuine part)
• Part number: 63-12-6-904-042
• BMW part name: bulb socket, turn indicator
• Position: turn signal in the headlight assembly
• BMW production start: September 2000
• Supersedes: 63 12 8 361 002 (not interchangeable backward)
• Sold as: one socket
• Warranty: 24 months

Common Questions

What are the signs of a failing turn signal socket?
Look for an intermittent or dead turn signal caused by poor electrical contact. Other signs are a burnt or melted socket housing from heat and resistance, and corrosion or moisture that leaves the bulb dim or flickering.

Can this socket replace 63 12 8 361 002 on an earlier car?
BMW treats the change as not interchangeable backward. Confirm your car's build date or VIN before you use this socket in place of the earlier number.

Is the M5 socket different from the 525i socket?
No. The E39 M5 with the S62 engine uses this same part number as the six-cylinder and 540i sedans.

Fitment & Compatibility

Confirm your model year and submodel against the table below before ordering. With over 20 years of parts and fitment experience, PMB Performance can match this to your VIN.