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2018 Mercedes-Benz CLA45 AMG Bulb Size Chart

Bulb sizes may vary by trim, factory lighting package, region, production date, and previous modifications. Verify the bulb number on your existing bulb before buying.

Last database update: May 2026. Manual review status: Not yet manually reviewed.

Verify before buying: check the bulb number printed on your existing bulb, confirm your trim and factory lighting package, and review the seller's fitment notes.
Disclosure: We may earn a commission from links marked Affiliate. Unmarked retailer links may be plain search links. Always verify bulb fitment before purchasing.

2018 Mercedes-Benz CLA45 AMG Bulb Size Chart

PositionBulb CodeAliasesTrim / PackageFactory TypeConfidenceReviewNotesShop
Turn Signal Front3457NA—Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
Daytime RunningH15—Standard listingHalogenMedium
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
High BeamH15—Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
Low BeamH7—Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

AmazoneBay
Turn Signal Rear7507—Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
Parking Light3457NA—Standard listingHalogenMedium
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
Reverse Light921—Standard listingHalogenMedium
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
Brake Light921—Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
Door LightW5W—Standard listingHalogenMedium
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
Map LightW5W—Standard listingHalogenMedium
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
Trunk LightW5W—Standard listingHalogenMedium
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon

2018 Mercedes-Benz CLA45 AMG Fitment Notes

Across the 2014-2020 production range, our database shows changes in the listed Turn Signal Front, Parking Light positions. Use the chart above for this 2018 model, then confirm the bulb number in your vehicle before buying.

Known fitment limitations

  • factory HID or LED packages may use different parts
  • fog lights may depend on equipment package
  • aftermarket headlight assemblies may use different bulbs
  • regional models and production-date splits may differ

See an incorrect bulb size? Submit a correction.

How do the 2018 Mercedes-Benz CLA45 AMG's bulbs compare to other years?

The 2018 Mercedes-Benz CLA45 AMG changed bulb sizes from 2017. The previous model year used a different configuration.

The 2019 model switched to a different bulb configuration.

This bulb configuration covers the 2018 model years. ← 2017 2019 →

Finding the best installation guide...

Other CLA45 AMG Years

202020192017201620152014

More from Mercedes-Benz

190D190E200200D220220D230230S

Other Vehicles That Use H7 Bulbs

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H7 Comparisons

9005 vs H7H1 vs H7H11 vs H7H4 vs H7

Frequently Asked Questions

Our database lists H7 for the 2018 Mercedes-Benz CLA45 AMG low beam headlights. Verify the bulb number on your existing bulb and confirm your trim or factory lighting package before buying.

Our database lists H15 for the 2018 Mercedes-Benz CLA45 AMG high beam position. Some vehicles vary by trim, lighting package, or previous housing changes.

Dim headlights on a 2018 Mercedes-Benz CLA45 AMG can come from aging halogen bulbs, cloudy lenses, weak electrical connections, or an incorrect bulb. Confirm the listed H7 size against the bulb in the housing before choosing a replacement or upgrade.

The 2018 Mercedes-Benz CLA45 AMG does not have a fog light bulb listed in our current database. If your vehicle has fog lights, verify the bulb in the housing or owner's manual before buying.

The 2018 Mercedes-Benz CLA45 AMG uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

LED upgrades are available for many H7 applications, but fitment, beam pattern, dashboard warnings, and road-use legality can vary. Use products that list your exact bulb family, such as H7, and verify the factory housing before buying.

Yes — the 2018 Mercedes-Benz CLA45 AMG uses different bulb sizes than the 2017 model. The 2018 generation introduced this bulb configuration.

The 2018 Mercedes-Benz CLA45 AMG is the only year in the 2018 generation to use the H7 bulb for the low beam headlight.

Access varies by engine bay layout and headlight housing. Before disassembly, confirm the listed H7 low beam size on the existing bulb or owner's manual, then follow the service procedure for your exact trim.

Rules for LED headlight retrofits vary by location and by housing type. Avoid products that create glare or lack road-use compliance claims, and check local requirements before using an LED conversion on public roads.

Replacement cost depends on bulb technology, brand, and labor access. Common halogen H7 replacements are usually cheaper than LED conversion kits. Check seller fitment notes before comparing prices.

Halogen bulbs and LED replacements differ in output, heat behavior, beam pattern, and electronics. A correct bulb code does not guarantee a correct LED beam pattern, so verify physical fit and seller compatibility notes for the 2018 Mercedes-Benz CLA45 AMG.