Skip the auto shop - Our mechanics make house calls

Q: Head lamp stays on

asked by on

My Mercedes's right headlamp stays on all the time and drains my battery. The dealer can figure out what is wrong. The low voltage causes the radio not to work. This is so frustrating. Can you think of any way to fix it? I am tired going to the dealer. Thank you.

A: A few faults can cause the vehicle to have ...

A few faults can cause the vehicle to have a headlight that remains on. The most common problems include a wiring short to power, switch issue, or the headlight itself.

If you’d like to get this fixed and you’re tired of going to the dealer, consider having the vehicle serviced by a qualified technician who will be able to diagnose the issue with your headlight. The necessary repairs can be made once the problem has been pinpointed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Instrument cluster cuts out but also signal indicators radio and possibly wipers - does seem like board or cluster issue

This may be related to a short or a faulty instrument cluster voltage regulator. The instrument voltage regulator regulates the voltage supplied to the various gauges in your vehicle’s dash. When this is not working properly, this may cause the...

Q: Sunroof stuck open

Hi. The sunroof becoming inoperable is a common problem that many R350 owners encounter. The sunroof motors Mercedes produced on these vehicles have been problematic for many owners. They often fail and will need replacement. However, the motor itself is...

Q: New battery; car won't start

Hello. If the car is not starting after a battery replacement then you either have a bad connection at the battery or it is possible that the programming in the computer got corrupted when the voltage was lost. This can...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.