A dark rear brake, tail, turn-signal or side-marker lamp on a 2016 Ford F-150 with the original serviceable incandescent rear lamp may be caused by a failed dual-filament 3157 bulb. The same bulb serves several functions, so diagnose the circuit before replacing parts. There is no dedicated OBD-II trouble code that proves this bulb has failed. This guide excludes factory optional LED rear lamps, sealed aftermarket housings and wiring faults.
Featured bulb
SYLVANIA 3157 Long Life miniature bulb, manufacturer part number 3157LL.BP2, Amazon ASIN B01FWOD0X2. The selected listing is one package containing two clear dual-filament 3157 incandescent bulbs. It does not include sockets, a lamp housing, seals, wiring, fasteners, tools or LED-conversion hardware.
Ford specifies a 3157, 27/8-watt bulb for the 2016 F-150 rear lamp’s brake, rear direction-indicator, rear side-marker and tail-lamp functions when the truck has the serviceable incandescent assembly. The two-pack is useful because aging bulbs on the same vehicle often have similar service time, although a good bulb does not have to be discarded.
Amazon displayed “1K+ bought in past month” on this exact two-count listing during a live check on October 24, 2026. That rounded badge is an Amazon purchase indicator, not audited sales data. Price, seller and availability can change, so check the listing directly.
2016 F-150 fitment and exclusions
| Application | Supported? | Selection check |
|---|---|---|
| 2016 North American Ford F-150, original serviceable incandescent rear combination lamp | Yes | Ford lists 3157, 27/8W for the rear brake, rear direction indicator, rear side marker and tail lamp. |
| Different engine, cab, bed length, trim or drivetrain | Potentially | Ford’s bulb chart is divided by lamp equipment rather than these configurations. Confirm the truck still has a removable 3157 socket and incandescent lamp before ordering. |
| Factory optional LED rear lamp | No | Ford says the LED rear lamp is not serviceable as an individual bulb. Do not pry open or retrofit the sealed assembly using this procedure. |
| Reverse-lamp position | No | The reverse position is a different socket and Ford specifies 3156K, 27W. |
| Center high-mount brake or cargo lamps | No | Those positions use different bulbs or optional LEDs. |
| Other model years, markets, aftermarket housings or LED conversions | Not verified | Match the owner’s manual and physical socket for the exact truck. Do not transfer this guide to a similar-looking lamp. |
Symptoms and diagnosis before replacement
A failed 3157 may make one rear position dark, cause the turn indicator to flash faster than normal, or leave one function working while another is out because the bulb contains two filaments. With an assistant standing clear of traffic, compare both sides using the tail lamps, hazard flashers and brake pedal. Also check the rear side-marker illumination at the affected lamp.
Do not assume the bulb is guilty if several lamps fail together, the fault changes when the harness moves, or the socket shows heat damage. Check the relevant fuse information in the owner’s manual, connector seating, socket contacts, ground path and wiring. Water droplets, corrosion or a blackened socket can cause a repeat failure. A new bulb cannot repair a cracked lens, poor ground, trailer-wiring fault or failed body-control output. Seek electrical diagnosis when power and ground cannot be established safely.
Equipment check: Before buying, look through the lens and verify that the affected lamp uses a removable bulb socket. A factory LED lamp does not have a serviceable 3157 bulb.
Tools and supplies
| Tool or Supply | Exact Product | Product Link | Purpose and Selection Check |
|---|---|---|---|
| Replacement bulbs — required | SYLVANIA 3157 Long Life, 3157LL.BP2, two bulbs | B01FWOD0X2 | Exact dual-filament incandescent type specified for the supported rear functions. Verify the truck does not have optional LED lamps. |
| Socket and hand ratchet — required | CRAFTSMAN 159-piece mechanics set, CMMT12125 | B07QJ32TZ5 | Provides 1/4-, 3/8- and 1/2-inch drive ratchets and a range of sockets. Confirm the two lamp-bolt heads on your truck and use the matching socket by hand. An existing small ratchet and correct socket are preferable if already owned; do not use an impact tool. |
| Clean handling cloth — recommended | Amazon Basics microfiber cleaning cloths | B009FUF6DM | Keeps dirt and skin oils off the bulb and provides a clean place for the housing. A clean, dry, lint-free cloth is an acceptable alternative. |
| Wheel chocks — recommended | Checkers UC1600 single urethane wheel chock | B004UMVMUG | Rated by the maker for 27–35-inch tires and a 40,000-pound gross vehicle weight. The listing is one chock; use two correctly sized chocks or equivalent existing chocks if added stability is needed. |
| Inspection light — optional | Streamlight 66118 Stylus Pro penlight | B0015UC17E | Helps inspect the socket and connector without energizing the exterior lamps. A phone light or existing flashlight is fine. |
Estimated DIY and professional cost
DIY: roughly $8–$25 for a two-bulb pack, with no separate consumable normally required. If you already own a ratchet, socket, clean cloth and chocks, there should be no tool purchase. These are planning estimates, not a current Amazon price or local quote.
Professional service: roughly $50–$140 for diagnosis and one straightforward bulb replacement, depending on local labor minimums and access. A corroded socket, water leak, damaged harness or LED assembly can cost substantially more because the repair is no longer a simple bulb exchange.
How to replace the rear 3157 bulb
- Identify the failed function. Before disassembly, compare the left and right rear lamps using tail, hazard and brake functions. Switch everything off after the check. This establishes whether the symptom follows a single bulb position or suggests a wider circuit problem.
- Secure the truck. Park on a level surface, select Park, set the parking brake and remove the key or transmitter from the work area. Add correctly placed chocks if the surface or work area warrants them.
- Open the tailgate. The lamp fasteners are exposed at the rear pillar with the tailgate open. Keep the tailgate supported and make sure it will not move into you or the lamp.
- Remove the two lamp bolts. Match a socket to the two visible bolt heads. Loosen them with a hand ratchet while holding the lamp. Ford does not publish a numerical torque for these lamp bolts in the owner procedure, so do not invent one and do not use an impact tool.
- Release the lamp housing. Pull the assembly carefully away from the pillar to release its two retaining tabs. Keep the pull controlled and close to the lamp’s installed direction. Do not twist the housing against the painted body or lever on the lens.
- Disconnect the electrical connector. Support the freed housing, release the connector lock and unplug the harness. Never let the housing hang from the wires.
- Select the correct socket. Ford identifies the brake/rear/direction-indicator socket separately from the reverse socket. Confirm you have the upper combination-lamp bulb, not the 3156K reverse position.
- Remove the socket and old bulb. Turn the combination-lamp socket counterclockwise and withdraw it. Remove the old 3157 straight from the socket using a clean cloth. Inspect the socket for heat distortion, dark terminals, moisture and corrosion; stop if repairs are needed.
- Install the new 3157. Handle the bulb with a clean, dry cloth, align its wedge base and seat it fully without forcing it. Insert the socket into the housing and rotate it clockwise until securely locked.
- Reassemble and test. Reconnect the harness until its lock engages. Align the two retaining tabs, press the housing into position and reinstall the bolts. Tighten them evenly and snug by hand; do not crush the plastic or claim an unsupported torque. Close the tailgate only after verifying clearance.
Final inspection and functional checks
- Confirm the housing sits flush and does not rock, and that the tailgate clears it.
- Verify tail, brake, hazard/turn and rear side-marker functions on both sides. Use an assistant for the brake check rather than wedging the pedal.
- Check that the turn signal now flashes at the normal rate and that the reverse lamp still works.
- Look through the lens for a bulb seated squarely in its socket. After the first wet-weather drive or wash, inspect for condensation that would indicate a sealing problem.
Common mistakes to avoid
- Ordering by appearance alone: optional LED assemblies are not a 3157 application.
- Changing the reverse bulb: the reverse position uses a different 3156K bulb.
- Pulling sideways or prying: the lamp releases from two retaining tabs and can crack if levered against the body.
- Letting the housing hang: this can damage the connector and harness.
- Ignoring a cooked socket: melted plastic or dark terminals require repair; a new bulb alone is unsafe and temporary.
- Overtightening the bolts: no numerical torque is supplied in Ford’s owner procedure. Snug the fasteners evenly by hand.
FAQ
Does one 3157 bulb handle the brake, tail and turn signal?
On the supported incandescent rear lamp, yes. Ford lists the 3157 dual-filament bulb for the rear brake, rear direction-indicator, rear side-marker and tail-lamp functions. A filament can fail while the other still works.
Should both sides be replaced together?
SYLVANIA recommends pair replacement for matched age and performance. It is reasonable preventive maintenance, but diagnose each side and do not discard a serviceable bulb merely to mask a socket or wiring problem.
Will an LED replacement work in the 3157 socket?
This guide validates only the specified incandescent 3157. LED conversions can change load, flash rate, optics, heat distribution and legal performance. Use a conversion only when the exact lamp and vehicle application have been independently verified.
Why does the new bulb still not light?
Recheck orientation and full seating, then test the socket, connector, fuse information, ground and wiring. Moisture, corrosion, trailer-wiring changes or a control-module circuit fault may require professional diagnosis.
Sources and related F-150 guides
- Ford 2016 F-150 bulb specification chart — 3157, 27/8W and optional-LED notes.
- Ford 2016 F-150 rear-lamp removal procedure — tailgate, two bolts, retaining tabs, connector and socket direction.
- SYLVANIA 3157LL.BP2 product page — exact part number, two-pack and handling guidance.
- Vehicle-reference photo source — Bull-Doser, public-domain release.
- Ford F-150 repair guides
- 2016 Ford F-150 license-plate bulb replacement
- 2017 Ford F-150 rear brake, tail and turn-signal bulb replacement
- Ask other Ford F-150 owners in the chatroom