2017 Acura TLX Headlight Bulb Size
The 2017 Acura TLX comes with factory LED headlights (not bulb-replaceable) on equipped trims.
Key takeaways
- Low beam: LED. High beam: LED.
- This trim has factory LED headlights - the low beam is not a replaceable bulb.
- Fog, signal, and reverse bulbs use different sizes - check each before buying.
- Fog light
- LED
- Brake / tail
- LED
- Rear turn signal
- 7440
- Reverse / backup
- 7440
- License plate
- LED
Low, high, fog, brake/tail, parking, license all non-replaceable factory LED. Bulb sizes can vary by trim and headlight type, so confirm against your existing bulb.
Headlights for the 2017 Acura TLX
This vehicle uses factory LED headlights on equipped trims. If one fails, the part is a headlight assembly, not a bulb, so it is usually a dealer or body-shop job rather than a DIY swap.
Search headlight assemblies on AmazonFor 2017 Acura TLXShopAs an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
There is no bulb to replace on this one
Every bulb on this vehicle
Headlights get the attention, but the small bulbs are what fail an inspection. A burnt-out brake or turn bulb is also the cheapest ticket you will ever get, and most of these are a few dollars and a twist to change.
| Position | Bulb | Type |
|---|---|---|
| Low beam (headlight) | LED | LED |
| High beam | LED | LED |
| Fog light | LED | LED |
| Brake / tail | LED | LED |
| Rear turn signal | 7440 | Miniature |
| Reverse / backup | 7440 | Miniature |
| License plate | LED | LED |
Low, high, fog, brake/tail, parking, license all non-replaceable factory LED.
Jewel Eye LED standard from launch. Front turn amber PWY24W (not in allowed short-code set, null). Reverse 7440 (interchangeable 7443/921).
Why this keeps getting harder
Headlight bulbs used to be a commodity: a handful of codes covered most cars and any of them cost a few dollars. That is ending. Across the vehicles we hold specs for, factory LED low beams went from 0% of 2000s cars to 59% of 2025-and-newer ones. LEDs last far longer, which is the upside and a real one. The tradeoff is that when they do fail, it is often not a bulb you can buy at all, and the fix moves from a $20 part to a headlight assembly.
- The full LED adoption study - how fast the fleet switched, measured across our own data.
- Halogen vs LED vs HID - what actually differs, beyond the marketing.
- The most common headlight bulb types
Frequently asked
What headlight bulb does a 2017 Acura TLX take?
Equipped trims use factory LED headlights, which are sealed assemblies rather than replaceable bulbs.
Can you replace the headlight bulb on a 2017 Acura TLX?
Before you shop: the 2017 Acura TLX has factory LED low beams, and on this vehicle they are not a replaceable bulb. The LEDs are built into the headlight assembly, so there is no part number to buy and no bulb to swap. If a low beam has failed, the fix is a new headlight assembly, which is an order of magnitude more expensive than a bulb and worth getting a diagnosis on first - LED headlights usually fail at the driver or a connector rather than at the diodes themselves, and that is often repairable.
See where this ranks in our study of the most common headlight bulb types in the US.