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Bmw 550I Cornering Light Sockets

Bmw 550I Cornering light sockets

Cornering light sockets start at $30.95 at AutoBuffy, where you'll find 3 options from brands including Standard Ignition and ACDelco. The cornering light socket connects the bulb to your vehicle's wiring harness, supplying power when you activate the turn signal or steering input. A failed socket causes the cornering light to go dark, reducing side-angle visibility during turns and risking a failed safety inspection.

Signs your Bmw 550I needs a new cornering light socket

  • Cornering light on one side stays dark even after replacing the bulb with a known-good unit
  • Cornering light flickers or cuts out intermittently when turning the steering wheel or signaling
  • Visible corrosion, melted plastic, or burn marks inside the socket housing
  • The socket terminal feels loose or pulls away from the bulb without resistance
  • Your Bmw 550I's onboard diagnostics or instrument cluster shows a front lighting fault or turn-signal circuit error
  • Turn-signal hyper-flash occurs on one side despite a new, correct-wattage bulb being installed

Which cornering light socket should you buy for your Bmw 550I?

The most important factors are terminal material and connector-body compatibility with your Bmw 550I's OEM wiring harness. Sockets are not universal — terminal count, pigtail length, and locking-tab style vary by platform, so confirming fit before purchase prevents a wasted trip under the hood.

OEM-Equivalent Replacement Socket
Best for
Owners who want a plug-and-play fit with no wiring modification
What you get
Exact terminal count and connector geometry matched to the factory harness; pre-installed weatherproof seal
Pigtail Socket Assembly (with lead wires)
Best for
Vehicles with burned or corroded wiring near the original socket
What you get
6–12 inches of new lead wire already attached; allows a clean splice away from damaged factory wiring
Sealed/Weatherproof Upgrade Socket
Best for
High-moisture environments or vehicles with a history of corrosion at this location
What you get
Silicone-sealed housing and tin-plated or gold-plated brass terminals that resist oxidation longer than standard terminals
Multi-Pack / Both-Side Kit
Best for
Owners replacing both cornering light sockets at once for preventive maintenance
What you get
Two matched sockets ensuring both sides age at the same rate; typically lower cost-per-socket than single units

Cornering light sockets brands we stock for your Bmw 550I

Standard Ignition
2 options · from $30.95
ACDelco
1 option · from $47.95

Replacing a cornering light socket on a Bmw 550I

Easy⏱ 15–30 minutesFlathead screwdriver or trim panel removal toolNeedle-nose pliersElectrical contact cleanerWire stripper and butt connectors (for pigtail assembly only)Dielectric grease

Access the cornering light socket by opening the hood or removing the relevant trim panel to reach the back of the lamp assembly, then twist the socket counterclockwise to release it from the housing. Disconnect the wiring harness connector, transfer or replace the bulb, plug in the new socket, and twist it clockwise to lock it in place before testing. If you are installing a pigtail assembly instead, strip the lead wires, connect them to the existing harness with proper butt connectors or solder, and secure with heat-shrink tubing for a weatherproof finish.

Frequently asked questions

How much does it cost to replace cornering light sockets on a Bmw 550I?
Parts alone start at $30.95 for a cornering light socket for the Bmw 550I. If you handle the swap yourself, that is your total cost. A shop may add 15–30 minutes of labor time. Buying a pigtail assembly costs slightly more but can save labor if the surrounding wiring is damaged.
Can a bad cornering light socket cause turn-signal hyper-flash on a Bmw 550I?
Yes. A corroded or open-circuit socket increases resistance in the turn-signal loop, which the flasher module reads as a missing or failed bulb and responds by speeding up the flash rate. Replacing the faulty socket restores normal resistance and eliminates hyper-flash without any other changes.
Is a cornering light socket the same as a parking light or turn-signal socket on a Bmw 550I?
Not always. Cornering light sockets occupy a dedicated position in the front lamp assembly and serve a specific side-illumination function during turns. While they may share a bulb base size with other sockets in the housing, the connector body, terminal layout, and pigtail wiring are often unique to that circuit.
Do I need to replace the bulb when I replace the cornering light socket on a Bmw 550I?
Not necessarily, but it is good practice. Heat and arcing from a failing socket can stress the bulb filament or glass base. If the old bulb shows any discoloration, pitting on the base contacts, or a darkened envelope, replace it along with the socket to avoid a repeat failure in the near term.
How do I know if my Bmw 550I uses a bayonet-style or wedge-style cornering light socket?
Check the original socket or your Bmw 550I's owner manual for the bulb part number. Bayonet-style bulbs have two pins on the side and twist to lock; wedge bulbs have no pins and simply press in. AutoBuffy's fitment filter confirms which socket type your vehicle requires before you add anything to your cart.
Will a corroded cornering light socket fix itself if I apply dielectric grease?
Dielectric grease prevents future moisture intrusion but cannot reverse existing corrosion or repair a burned terminal. If the socket already shows visible oxidation, carbon tracking, or a loose terminal fit, the socket should be replaced. After installing the new socket, applying a small amount of dielectric grease to the terminals is a worthwhile protective step.

Shop cornering light sockets by year for the Bmw 550I

201320122011201020092008

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