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 1,000 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!
  1. Home
  2. Questions
  3. Fuel light flashes, check engine light on

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: Car won't start - 1988 Mercedes-Benz 300TE

Hey there. Your fuel pump may have a heat related failure and needs to be cooled to get it to work. The pump is in the fuel tank and needs to be tested first by a mechanic to see if...

Q: Whining and buzzing noise coming from head unit - 1997 Lexus LX450

I would check with the Alpine distributor who sold you this unit, and discuss your situation with them. They may have included relevant comments on mounting the head unit with the unit itself, but in any case, their Customer Service...

Q: Is it necessary to remove the front bumper to replace the power steering pump on a 2012 Audi A8L?

Hey there, thanks for writing in about your 2012 Audi A8 Quattro. No, it shouldn't need to be removed to change the power steering pump. If you end up needing help with the installation, a certified expert from YourMechanic can...

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...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...