Skip the auto shop - Our mechanics make house calls

Q: Fuel light flashes, check engine light on

asked by on

My car has recently developed an issue with the fuel light that started flashing for no apparent reason. This occurs while I'm driving with about half of gas tank or more. The fuel light starts to flash, which is followed by the check engine light coming on as well. I had the fuel cap replaced. What might cause this?

Hi there, thanks for writing in about your 1997 Mercedes-Benz S420. The fuel light circuit receives information from the fuel level sending unit to show the approximate fuel level and give a warning as the level becomes low. There can be a malfunction in the sending unit circuit or the circuit for the lighting. I recommend having an experienced technician diagnose the warning lights in order to make the appropriate repairs.

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: Fuel gauge only rises to half tank when completely filled

This is a problem likely related to your fuel tank sending unit. The fuel gauge sending unit is a small float type component (or sensor) inside your fuel tank that measures the level of the fuel inside the tank. As...

Q: Will the check engine light cut off automatic

In some rare instances your check engine light may disappear by unhooking the battery, however this is not recommended since doing this may be avoiding a potentially more serious problem temporarily by clearing the code this way. If there is...

Q: Does Ford escape has fuel cap?

If you open the gas door and do not see a gas cap then look for a sign that say easy fill no gas cap required. If you see this then your vehicle is not equipped with a gas cap....

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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.