What bulb do I have to get if my taillight is out in a Honda Accord 7th gen 2004 LX?

Two bulbs per taillight are typically required: a 3156 for the taillight (running light) and a 3157 for the brake light and turn signal. Replace the dead bulb, and if you’re unsure which filament is out, examine the taillight to identify whether the taillight or brake/turn function is failing.

This article explains which bulbs fit the 2004 Honda Accord LX (7th generation), how to identify which filament is out, and how to replace the bulbs safely.

Bulbs that fit the taillights on a 2004 Honda Accord LX

The taillight assembly on the 7th-generation Accord uses two dual-filament bulbs per side. The tail-light function uses a 3156 bulb, while the brake light and turn signal use a 3157 bulb. If you’re replacing a single nonworking taillight, you’ll typically need to replace the corresponding bulb (3156 for tail, 3157 for brake/turn) and test both functions.

• 3156 bulb for the taillight (running light) function


• 3157 bulb for the brake light and turn signal function

Having both bulbs on hand ensures you can restore full functionality to the entire taillight assembly and avoid mismatched brightness between the functions.

How to replace the taillight bulbs on a 2004 Accord

Here are practical steps to swap in new bulbs without damaging the lens or wiring. Accessing the taillight typically requires some trunk interior access to reach the bulb sockets.

1. Open the trunk and locate the taillight access area. If needed, remove screws or clips holding the taillight assembly or trunk liner to access the bulb sockets.


2. Disconnect the electrical connector from the bulb socket and rotate the socket counterclockwise to release it.


3. Remove the old bulb by pulling straight out. Compare with a new 3156 or 3157 bulb to ensure correct fit.


4. Insert the new bulb into the socket, then reinsert the socket into the taillight housing and rotate clockwise to secure.


5. Reconnect the wiring harness and test the taillight by turning on the running lights and then the brake/turn signals to confirm both functions illuminate properly.

Common tips: wear gloves or use a cloth to handle bulbs to prevent oils from your skin from shortening bulb life. If you’re replacing one bulb and the other side is dim, consider replacing both sides for even lighting. If the taillight still doesn’t light after bulb replacement, check the fuse labeled TAIlIGHT or REAR in the vehicle’s fuse box, and inspect wiring for corrosion or damage.

Upgrading or alternatives

For those considering upgrades, LED replacements are available for some taillight assemblies, but compatibility depends on housing and vehicle electronics. LED swaps may require resistors or load equalizers to prevent bulb-out warnings or hyper-flashing, so verify compatibility with your specific trim and market.

Summary

For a 2004 Honda Accord LX (7th generation), taillight issues are typically solved by bulbs 3156 (tail light) and 3157 (brake light/turn signal) per side. If a taillight is out, identify which function is dark, replace the corresponding bulb(s), and test all taillight functions. Always check fuses and wiring if replacing bulbs doesn’t restore operation.

Which light bulb is the tail light?

Taillights are also red, like brake lights, but at a much lower intensity so they won't be mistaken for the brake light bulbs. They may share the same bulb as the brakes or be separate – it depends on your vehicle's design.

What kind of bulbs do Honda Accords use?

Honda Accord (2016) Bulb Size Chart

How to replace Honda Accord tail lights?

And take the bulb. Out. Place the bulb. And put the bulb. Back by turning it clockwise.

What headlight bulb do I need for a Honda Accord 2004?

HONDA ACCORD 2004 headlight bulb chart