Skip the auto shop - Our mechanics make house calls

Q: Rear and side lights malfunction

asked by on

My car has a mileage of around 120,000 miles and recently the check engine light came on. The car is usually running fine. When I start it and press the check button, it indicates the issue with the rear lights. I've had the spark plugs replaced recently. I regularly change the oil. All the fuses check out fine, except some of them that looked worn, which I replaced. All other lights work properly, including the signals, front lights, back up and brake lights. However, there is still a problem with side and rear ones that have been malfunctioning. What should I do to fix this?

You may already know that your Audi has a sophisticated exterior lighting system that is computer controlled, monitors its own operation for faults, and communicates with other computer controlled systems on the car’s network. This means that when it’s time to diagnose a system fault, a scan tool is required that is compatible with Audi.

One thing you can do is inspect all the exterior lights carefully making sure all of them illuminate normally. All the bulbs installed must be the correct number or it can cause issues. There is also a Lamp Control Module involved in the operation of the system. Proper function of the brake pedal switch is an important input to your car’s overall operation. These are the types of tests that require a scan tool to check for faults. If you want to have this looked at, a certified technician from YourMechanic can come to your car’s location to diagnose your light issues.

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: Left dipped headlight/main

Hi there. If you are lucky this is just a bad bulb. If the bulb filament failed, the module will notice turning this light on. Most of the time, though this is a failure in the ballast for the light...

Q: Check engine light and stalling

Hello. The symptoms you describe can be caused by many things. An issue with the engine management, fuel, or ignition systems can all cause performance issues, and if serious enough, stalling. Anything ranging from a bad engine management sensor, to...

Q: After replacing valve cover gaskets, car runs horrible, and throws 5 different codes.

Hi there. Look on the engine for any ground wires. There could have been a ground wire that was disconnected to remove the valve covers causing all of the codes to appear. A ground that is not hook up can...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.