Buy BMW 428i Parking, Corner, Side Marker, Signal Light

Quick Summary

The BMW 428i's turn-signal light-also called a blinker, indicator lamp, flasher, or side-repeater-uses a PY24W 24-watt halogen bulb at the front and a 7506/PY21W bulb at the rear on most 2014-2016 models. Upgrading to LED versions boosts brightness and life but can cause "hyper-flash" unless the car is coded or load resistors are added. Federal rules say front indicators must shine amber and blink 60-120 times per minute, while state laws require both sides to work or you may be ticketed. Replacing the lamp takes about 10 minutes with a screwdriver through the wheel-well hatch. Prices run \$3-\$20 for a standard bulb and \$40-\$80 for quality LED kits. Always recycle old bulbs-many contain glass and metal that shouldn't go in household trash.

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Part Basics

* **Name & Role** - The turn-signal light warns other drivers when you plan to turn or change lanes. It sits in the head-lamp housing up front and in the tail-lamp cluster at the rear. ([Dealer eProcess])

* **Factory Bulb** - PY24W (24 W, 12 V, amber, PGU20-4 base) up front; 7506/PY21W (21 W, BAU15s base) in back. ([PartsGeek], [BulbAmerica])

* **Brightness** - About 280-300 lumens for stock halogen. ([Alibaba])

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How It Works

When you move the stalk, a relay or body-control module pulses power to the bulb. It flashes around 90 times per minute to meet federal and SAE standards. ([eCFR], [SAE International])

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Fit & Compatibility

The same PY24W front bulb is shared by BMW 428i, 430i, 435i, and 440i coupes (F32) built 2014-2016 and many xDrive or Gran Coupé variants. Always match the head-lamp type-cars with Xenon or LED headlights still use the same indicator socket. ([PartsGeek], [CarCareKiosk])

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Bulb Options

| Type | Lifespan | Notes |

| ----------------- | --------- | --------------------------------------------------------------------------------------------------------------------- |

| Halogen PY24W | \~500 h | Cheap, plug-in. ([BulbAmerica]) |

| Long-life Halogen | \~1 000 h | Thicker filament, lower brightness. ([AutoZone.com]) |

| LED Retrofit | 20 000 h+ | Up to 4× brighter, draws <6 W, runs cooler. Requires CAN-bus friendly design. ([Diode Dynamics], [Bimmerpost]) |

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LED Upgrades

Modern LED "switchbacks" swap amber blinking with white running-light mode but must still flash amber to stay legal under FMVSS 108. ([eCFR])

Hyper-flash (rapid blinking) happens because LEDs draw less current; fix it by:

1. Coding the body control module (dealer or specialist). ([E90Post])

2. Adding 6-ohm load resistors in parallel (one per bulb). ([BMW Sport Touring], [Diode Dynamics])

Mount resistors on metal-they reach 200 °F.

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Common Problems

* **Burned-out filament** - Most frequent, causes fast flash on dash. ([CarCareKiosk])

* **Moisture in housing** - Fogged lens can corrode the socket.

* **Socket melt** - Over-watt bulbs overheat plastic.

* **Wiring break** - Look for broken ground wire if both sides fail.

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Diagnosis

1. Turn hazards on; walk around the car. The dark side pinpoints the failed lamp. ([CarCareKiosk])

2. Swap the suspect bulb left↔right. If the problem follows the bulb, replace it.

3. Check for a "bulb out" i-Drive warning.

4. Measure voltage at the socket (should read battery voltage with stalk active).

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Replacement Steps

*Front bulb* (F32/F36):

1. Turn wheel inward for room.

2. Remove three 8 mm screws on the fender-liner door.

3. Pull the liner flap back to see the round bulb holder.

4. Twist holder counter-clockwise ⅛ turn, pull out. ([Bimmerpost])

5. Tug bulb straight out (no twist).

6. Push new PY24W in firmly-avoid touching glass.

7. Re-install holder, liner, screws. Test flash.

The process takes \~10 minutes and no special tools. A **video tutorial** is available on [CarCareKiosk](https://www.carcarekiosk.com/video/2016_BMW_428i_xDrive_Gran_Coupe_2.0L_4_Cyl._Turbo_Hatchback_%284_Door%29/lights/turn_signal_front) for visual reference. ([CarCareKiosk])

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Legal Rules

* Front indicators must shine **amber/yellow**; rear may be amber or red. ([eCFR], [eCFR])

* Minimum mounting height is 15 inches (381 mm) from the ground. ([eCFR])

* Flash rate must stay between 60-120 per minute. ([eCFR])

* Check open recalls by VIN on the [NHTSA Recall Lookup](https://www.nhtsa.gov/recalls) site. ([NHTSA])

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Safety Tips

* Replace bulbs in pairs-old ones dim before failing. ([CarCareKiosk])

* Wear gloves; oils on skin shorten bulb life.

* After install, test hazards, brakes, and running lights to be sure nothing else was disturbed.

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Cost & Value

| Item | Typical Price (USD) |

| ----------------------------------------------------------------------------- | ------------------------------------------------------ |

| Standard PY24W bulb | \$3 - \$8 each ([PartsGeek]) |

| Premium halogen | \$15 - \$25 |

| Quality LED kit (pair) | \$40 - \$80 including resistors ([Diode Dynamics]) |

| Labor at an independent shop averages 0.3 hr, or \$45 - \$60 in most regions. | |

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Disposal & Recycling

Never toss spent automotive bulbs in regular trash. Glass shards and trace metals harm landfills. Package them and drop off at local hazardous-waste or recycling centers, following EPA guidance. ([US EPA], [Better Homes & Gardens])

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Frequently Asked Questions

**Q:** What bulb does a 2014-2016 BMW 428i front blinker use?

**A:** A PY24W 24-watt amber bulb with a PGU20-4 base. ([PartsGeek])

**Q:** Can I put LEDs in place of halogen?

**A:** Yes-choose a CAN-bus-safe PY24W LED and add coding or resistors to avoid hyper-flash. ([Diode Dynamics])

**Q:** Why is the indicator blinking fast?

**A:** The car detects low current from a burnt bulb or an LED without load resistors, so it speeds up the flash. ([Bimmerpost])

**Q:** Do both turn-signal lights have to work to pass inspection?

**A:** Yes. U.S. law requires functional lamps on both sides or the vehicle is deemed unsafe. ([eCFR])

**Q:** What color must the front signal be?

**A:** Amber (yellow) only. White or blue is illegal. ([eCFR])

**Q:** How long does a stock bulb last?

**A:** Roughly 500 hours of flashing-about 3-4 years for most drivers. ([BulbAmerica])

**Q:** Will installing LEDs void my warranty?

**A:** Using non-BMW bulbs can void coverage on the bulb itself but normally won't affect the full vehicle warranty unless damage occurs. Check your manual for specifics. ([Dealer eProcess])

**Q:** Is there a recall for BMW 428i turn signals?

**A:** None specific to this model year, but always verify using your VIN on the NHTSA site. ([NHTSA])

**Q:** How do I recycle dead bulbs?

**A:** Place them in a sealed box and bring to a hazardous-waste drop-off or bulb-recycling program as recommended by the EPA. ([US EPA])

**Q:** What tools do I need to change the front bulb?

**A:** A flat screwdriver or 8 mm socket and gloves-nothing else. ([Bimmerpost])

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```

: https://cdn.dealereprocess.org/cdn/servicemanuals/bmw/2016-4series.pdf?utm_source=chatgpt.com "[PDF] THE BMW 4 SERIES COUPE. - Dealer E Process"

: https://www.partsgeek.com/3ljvnqj-bmw-428i-turn-signal-light-bulb.html?srsltid=AfmBOorKnZNvtWM8FMUbYWmSgYFIxV1u16-SLq9hvDwcdYX4CHEp-lrD&utm_source=chatgpt.com "2014 BMW 428i Turn Signal Light Bulb - Flosser 69690533 - Front ..."

: https://www.bulbamerica.com/products/osram-7507-py21w-12v-bau15s-original-high-performance-automotive-bulb?srsltid=AfmBOoqzNf_chr0MeYufbsGDJBOOQwtLossadUGWnSuF6Bo3ZF_oWjgO&utm_source=chatgpt.com "Osram 7507 PY21W 12V BAU15s ORIGINAL High-Performance ..."

: https://www.alibaba.com/showroom/py24w-bulb.html?utm_source=chatgpt.com "PY24W Bulbs - Brighten Your Way With LED Efficiency - Alibaba.com"

: https://www.ecfr.gov/current/title-49/subtitle-B/chapter-V/part-571/subpart-B/section-571.108?utm_source=chatgpt.com "49 CFR 571.108 -- Standard No. 108; Lamps, reflective devices, and ..."

: https://www.sae.org/standards/content/j588/?utm_source=chatgpt.com "J588B (WIP) Turn Signal Lamps for Use on Motor Vehicles Less ..."

: https://www.partsgeek.com/fyvng8k-bmw-428i-xdrive-turn-signal-light-bulb.html?srsltid=AfmBOoqK_Hg13H475JmPWazHy_Ta7OC7RGBHelO-CuetNV78kUze4NIq&utm_source=chatgpt.com "Front Turn Signal Light Bulb - 2014-2016 BMW 428i xDrive"

: https://www.carcarekiosk.com/video/2016_BMW_428i_xDrive_Gran_Coupe_2.0L_4_Cyl._Turbo_Hatchback_%284_Door%29/lights/turn_signal_front?utm_source=chatgpt.com "Front Turn Signal Replacement on 2016 BMW 428i xDrive Gran ..."

: https://www.autozone.com/electrical-and-lighting/turn-signal-light-mini-bulb/bmw/428i?utm_source=chatgpt.com "BMW 428i Turn Signal Light Mini Bulb - AutoZone.com"

: https://www.diodedynamics.com/rear-turn-signal-leds-for-2014-2020-bmw-4-series-pair.html?srsltid=AfmBOorOaW821gIqOS_jtwj_acXnoQhCTvuca8H_46nebyAog5daUy3Z&utm_source=chatgpt.com "Rear Turn Signal LEDs for 2014-2020 BMW 4 Series (pair)"

: https://f30.bimmerpost.com/forums/showthread.php?t=1891698&utm_source=chatgpt.com "Rapid blinking and error message on GTS tail lights | F30POST"

: https://www.e90post.com/forums/showthread.php?t=650332&utm_source=chatgpt.com "LED rear turn signals with resistor throwing error - Bimmerpost"

: https://www.bmwsporttouring.com/topic/99779-mounting-resistors-for-led-signals/?utm_source=chatgpt.com "Mounting resistors for LED signals - Oilheads - BMWSportTouring"

: https://www.carcarekiosk.com/video/2014_BMW_320i_2.0L_4_Cyl._Turbo/lights/turn_signal_front "Front Turn Signal Replacement on 2014 BMW 320i 2.0L 4 Cyl. Turbo"

: https://f80.bimmerpost.com/forums/showthread.php?p=17972021&utm_source=chatgpt.com "DIY: Front Turn Signal Light upgrade to LED bulb - Bimmerpost"

: https://www.ecfr.gov/current/title-49/subtitle-B/chapter-III/subchapter-B/part-393/subpart-B/section-393.11?utm_source=chatgpt.com "49 CFR 393.11 -- Lamps and reflective devices. - eCFR"

: https://www.nhtsa.gov/recalls?utm_source=chatgpt.com "Check for Recalls: Vehicle, Car Seat, Tire, Equipment - NHTSA"

: https://www3.epa.gov/region02/waste/spent-lamp.pdf "Fluorescent Lamp Disposal and Recycling in EPA Region 2"

: https://www.bhg.com/items-to-never-put-in-trash-8746233?utm_source=chatgpt.com "10 Items You Should Never Put in the Trash"