Car was running good, took a ride and came home, turned the ignition off and car won't will not start again. What could the problem be? [email protected]

why has the fault codes not being read or if they have been what are the codes

Mercedes Benz 300SE Won Start

Mercedes won start

Check fuel line for leak,

Don't worry. No respectable thief would care about your mercury-they're all after Hondas!
You could buy a new key cylinder and have it installed. Or maybe it is just part of the locking mechanism binding or stuck. As it stands, you have a secret, magic key. Only you know how to start your car. Some randy kids happening by, looking for a joy ride from someone stupid enough to leave their keys in the ignition, would only glance in your car and seeing no key, would keep right on going. You, wise old you, took your key with you! lol. Good luck.

If it is a 3.8 engine change the crank sensor,they go bad on the 3.8 engines.

Done cars have a kill switch if they are low on oil. Check your oil. If the oil is good, it may be the ignition switch.

CHECK FOR A LOOSE BATTERY GROUND OR IGNITION RELAY.

It may be a bad ignition switch.

Also, It could be a fuel pump, remote chance. A fuel pressure test would prove if bad. Should have 40 psi of pressure.

Any warning lights on, on the instrument panel? Check engine light? Or, they come on after the stall?

I would try WD-40, spraying down beside the key with a spray nozzle on the end before I took it to a repair shop or pulled the steering wheel.

Have you checked that you have power to the coil on cranking?You may also want to check wether you have a good strong spark at the spark plug.It could be an ignition module breaking down.If you have no power to the coil you may need to change the ignition relay.Its close to the battery.