What is the model number of the Elantra tail light?

[MaciRose]

The Elantra tail light (brake light) model number is 1157. The tail light, which is positioned as close to the rear of the vehicle as possible, is a white light that displays continuously. Tail lights are characterized by high luminous intensity, reasonable light intensity distribution, fast light rise time, long lifespan, maintenance-free operation, and low energy consumption. Adjustment can be made by loosening or tightening the screws behind the tail light. Below is a classification of automotive lights: 1. Headlights: Combined headlights are located at the front of the vehicle, primarily serving illumination and signaling purposes. The light emitted by headlights illuminates the road ahead, enabling safe driving at night. 2. Combined tail lights: Located at the rear of the vehicle, these mainly serve illumination and signaling purposes. 3. Turn signals: Used to indicate left or right turns to other road users. Regulations require these to be amber in color. 4. License plate lights: These primarily illuminate the license plate, allowing people to identify the vehicle's license plate at night.

[MacGriffin]

I own a Hyundai Elantra myself, and I’ve actually paid attention to the tail light bulb specifications. The factory manual clearly states: the brake light uses a P21/5W dual-filament bulb, the reverse light is W16W, and the turn signal is a PY21W amber bulb. However, the most reliable method is to remove the old bulb and check its markings—for example, the rear fog light on my 2018 model is a W21W bulb. There might be variations across different model years; when I helped a fellow owner replace the tail lights on a 2017 model, I noticed the turn signal socket was different from mine. If you’re upgrading to LEDs, make sure to choose CANBUS-compatible versions, otherwise, the dashboard will keep throwing error warnings, which can be quite annoying.

[LeAdam]

After a decade in auto repair, I've seen numerous Elantra taillight failures. Common types come in three variants: brake lights mostly use 1157 (P21/5W) dual-contact bulbs, turn signals employ 7507 amber single-contact bulbs. Last time when helping a customer replace the rear fog light, we found it used T20 specification. Always bring your old bulb for comparison when supplying your own bulbs to the workshop - last year a customer's online-purchased W16W reverse light wouldn't fit their 2018 model socket, later discovering the pin angle differed by 15 degrees. For newer LED replacement bulbs, make sure they're CANBUS-compatible decoder types. Regular bulbs cost 40-50 yuan, while decoder-equipped versions run about 100 yuan.

[ColemanFitz]

The Elantra's taillight assembly consists of four independent units. The high-mounted brake light uses a W16W wedge base bulb, while the T20 rear fog light is concealed within the reflector panel on the rear bumper. In the main left/right light clusters, the most prominent red bulb is a P21W dual-filament brake/tail combo light (note the twin-filament structure), with PY21W amber bulbs for turn signals. Actual power measurements during last bulb replacement: 5W for tail lights, 21W for brake lights. Avoid roadside stalls for bulb replacements - many online sellers mistakenly send BA15S sockets (Honda standard) when Hyundai actually uses BAY15D with alignment tabs.

[SpencerMarie]

Last month, I just replaced the taillights on my 2017 Elantra. Practical disassembly experience sharing: When you unplug the turn signal socket, you can see the H21W marking, and the brake light base is engraved with 1156. The most troublesome part is the side marker light—you have to remove the entire lamp housing to replace that tiny W5W bulb. I recommend upgrading to Philips or Osram bulbs, which can increase nighttime brightness by 30%. If switching to LEDs, note that the rear fog light must be red—I once saw someone get pulled over by traffic police for installing white LEDs. Bulb positions may vary across model years, so take a photo of your illuminated taillight for the seller to confirm before purchasing.

[MacJackson]

It's recommended to directly check the electronic catalog at an auto repair shop. The accessory codes for Hyundai models are too complex. For example, MOCAL's catalog shows the Elantra taillight comes in three variants: the 2016-18 models use the 921 bulb for brake lights, while post-2019 models switched to 7443. The rear fog light is even more troublesome - base models use standard T20 bulbs, while premium versions with lenses require special H16 sockets. Last week when changing a bulb for my wife's car, what should've been a 5-minute job ended up with three trips to the auto parts market. Better to spend 20 yuan and let the mechanics handle it - they keep bulb cross-reference charts on hand, which saves much more hassle than DIY research.