Skip the auto shop - Our mechanics make house calls

Q: Car doesn't recognize the key when it's inserted

asked by on

I'm having trouble with my car recognizing the key. Sometimes it takes dozens of times before it recognizes it. What causes this type of problem and what should I do?

A: There are several common possible issues. L...

There are several common possible issues. Low battery voltage can cause this type of situation to occur. Another possibility is a problem in the drive authorization system. The key itself is also something to consider. The drive authorization system needs to be checked by looking at key statuses, faults, etc. This needs to be done with a Mercedes diagnostic tool.

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・Save up to 30%

Get a quote

What others are asking

Q: My car won't accelerate in D5 or D4, I have to shift manually

This may be a sign of a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates a transmission solenoid, which directs transmission...

Q: Erratic Idle

Hello! It sounds like you may have a dirty or faulty idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds...

Q: Key won't turn shift

Greetings. Thanks for writing in about your 1998 Saab 900. It sounds like your ignition cylinder may have seized up. This can happen over time due to key tumblers inside the ignition cylinder itself becoming out-of-shape and unable to make...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...