Upgrade or restore your Mercedes-Benz M-Class (W166) with this aftermarket LED rear outer tail light (left side) — compatible with part number 1669063301. At DDP AutoParts, we offer top-quality LED lighting replacements that deliver both style and safety, backed by durable construction and reliable illumination. This unit fits perfectly with your vehicle’s existing wiring, making installation straightforward, and provides crisp, modern LED performance across brake, indicator, and parking lights. Whether you're replacing a broken or faded tail light, or simply enhancing your vehicle with a sportier lighting look, this tail light is a cost-effective and long-lasting choice.

OEM Number: 1669063301, A1669063301,

Placement on Vehicle : Passenger Side, Outer, Rear, Left

Lamp Type : LED, P21W

Section : Outer section

Voltage : 12V

Quantity : 1

Our SKU: TM1669063301_94

All our Rear Tail Light Lamp Led Outer Left For Mercedes-benz M-class W166 2011-2015 are OEM quality and reliable after market car parts. This Rear Tail Light Lamp Led Outer Left For Mercedes-benz M-class W166 2011-2015 is specifically compatible with Mercedes-Benz: M-Class, .

Please use our make-model-year tool to check this part's compatibility with your vehicle. However, please note that our tool is for reference only and we recommend that you check the part number on your old unit prior to purchasing.

If you are still not sure about the compatibility of this part to your vehicle, please supply us with the VIN number or Reg number in our live chat or contact form! You can also find details on our purchasing & shipping guide here.

❓ FAQs 

1. Will this tail light fit my Mercedes-Benz M-Class (W166)?
   Yes — this tail light is designed specifically for W166 models (2011–2015) that use the OEM reference 1669063301 / A1669063301. Provide us with your VIN, and our team will double-check compatibility to make sure it's the right match for your vehicle.

2. Is this a genuine Mercedes part?
   No — this is a high-quality aftermarket LED tail light, not an OEM unit. But being aftermarket doesn’t mean lower quality: we source parts that meet strict manufacturing standards, so you get great performance and durability without breaking the bank.

3. How reliable is the LED performance?
   Very reliable. The LED modules provide bright, even light output for brake, rear, and indicator functions. The housing is built from tough materials and sealed to resist moisture and vibration.

4. Do I need to do any coding or programming?
   Usually not. Many customers report that this tail light is plug-and-play — it connects directly to the existing wiring harness. That said, some vehicles (depending on how their SAM/BCM is configured) may throw a “lamp malfunction” warning, especially with aftermarket LEDs. In that case, our support team can suggest solutions or compatible resistor modules.

5. Could I get a dashboard error after installation?
   There’s a small chance of a “lamp malfunction” alert, especially if the onboard modules detect a load difference. But this is rare with our parts, and if it does happen, we’ll help you fix it quickly via compatibility checks or recommended workarounds.

6. How difficult is it to install this tail light?
   For someone experienced, installation is straightforward:

   • Remove the trim or tailgate interior panel

   • Unscrew the old tail-light unit

   • Disconnect the original connector

   • Plug in your new LED tail light

   • Secure with screws / bolts, and test all light functions

   If you’re unsure, a professional installer will work fine too — and it's usually a quick job.

7. Do you offer a warranty or return policy?
   Yes — every tail light from DDP AutoParts comes with a standard warranty and our reliable customer support. If the part doesn’t fit, or if you run into any issues, just contact us and we’ll help resolve it or process a return.

8. Is this tail light road-legal?
   Many of our aftermarket tail lights are E-marked / compliant with road safety standards. If you have any concerns about legality in your country (UK / EU), just ask us — we’ll check the specific product’s certification for you.