HomeElectrical, Lighting and Body > Lighting - ExteriorTYC 20-6778-90-9 Headlight Assembly - Left
Part #: 20-6778-90-9

TYC 20-6778-90-9 Headlight Assembly - Left

CAPA Certified, Left
⚙️ 18 vehicles fit this part
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Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
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✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
📦CAPA Certified, Left
🚗Fitment: Buick, Lucerne
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

Overview of TYC CAPA Certified Headlight Assembly

The TYC CAPA Certified Headlight Assembly 20-6778-90-9 is designed specifically for the left side of Buick Lucerne models. This headlight assembly includes halogen bulbs and features clear and amber lenses to meet lighting and signaling requirements.

  • Includes halogen bulbs for low beam, high beam, and daytime running lights
  • Clear and amber plastic lens for durability and visibility
  • Plastic housing material designed for long-lasting performance
  • SAE/DOT compliant for safety and legal standards
  • Compatible with Buick Lucerne vehicles, left side position

Detailed Product Description

This TYC headlight assembly, part number 20-6778-90-9, is engineered to restore proper lighting function on the left side of Buick Lucerne vehicles. The assembly comes with halogen bulbs included for low beam, high beam, and daytime running lights, ensuring a complete lighting solution. The lens combines clear and amber colors, providing both headlight illumination and turn signal visibility. Constructed with durable plastic for both the lens and housing, this headlight assembly offers resistance to environmental elements while maintaining a lightweight design.

The CAPA Certified product line from TYC ensures that this headlight assembly meets or exceeds the standards set by the Certified Automotive Parts Association. This certification confirms the part’s quality, fit, and function, making it a reliable replacement for your Buick Lucerne’s exterior lighting needs.

Common Applications and Issues Addressed

  • Replacement for cracked or damaged left headlight assembly on Buick Lucerne
  • Restores proper low beam and high beam lighting performance
  • Fixes issues with non-functioning daytime running lights
  • Improves visibility and signaling with clear and amber lens components
  • Ensures compliance with SAE/DOT lighting regulations

Installation Notes and Tips

When installing the TYC 20-6778-90-9 headlight assembly, ensure the vehicle is turned off and the battery is disconnected to avoid electrical hazards. This assembly is designed for the left side of Buick Lucerne models and should align with existing mounting points for a secure fit. Since halogen bulbs are included, no additional bulb purchases are necessary. Verify all electrical connections are secure before testing the lights.

Quality Assurance and Warranty

The TYC CAPA Certified headlight assembly 20-6778-90-9 complies with SAE and DOT standards, ensuring it meets safety and performance requirements. The CAPA certification further guarantees that this part matches OEM specifications for fit and function. Please refer to TYC’s warranty policy for specific coverage details.

BrandTYC
Part Number20-6778-90-9
PositionCAPA Certified, Left
Bulbs IncludedYes
Lens ColorClear, amber
Bulb TypeHalogen
Lens MaterialPlastic
Housing MaterialPlastic
Daytime Running Light Bulb TypeHalogen
High Beam Bulb IncludedYes
High Beam Bulb TypeHalogen
Low Beam Bulb IncludedYes
Low Beam Bulb TypeHalogen
Other Side20-6777-90-9
PositionLeft
Sae/dot CompliantYes

This part fits 18 vehicles. Search below:

YearMakeModelSubmodelBody TypePositionNotes
2011BuickLucerneCXSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2011BuickLucerneSuperSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2011BuickLucerneCXLSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2010BuickLucerneCXL Special EditionSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2010BuickLucerneCXLSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2010BuickLucerneCXSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2010BuickLucerneSuperSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2009BuickLucerneSuperSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2009BuickLucerneCXLSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2009BuickLucerneCXSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2008BuickLucerneCXSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2008BuickLucerneCXSSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2008BuickLucerneCXLSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2008BuickLucerneSuperSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2007BuickLucerneCXLSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2007BuickLucerneCXSSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2006BuickLucerneCXSSedanLeftOther Side: 20-6777-90-9; CAPA Certified
2006BuickLucerneCXLSedanLeftOther Side: 20-6777-90-9; CAPA Certified

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

25974773

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.