Do benz 230 e have crank sensor if so where is it found on engine

Check the rpm speed sensor, or the flywheel sensor.
http://www.mercedesmedic.com/mercedes-camshaft-hall-sensor-cam/

There may be a wiring issue with the harness to the ecu, or a rusty ground wire.

You'll need to have the crank sensor replaced.

Is there power on the positive injector terminals when the key is on? If not, the problem may be a relay. If the circuit has power, the problem is more likely the camshaft sensor or security system. Need year and engine size to find diagrams.

I have a Mercedes Benz and the part that causes that Same problem is the crank shaft position sensor. When its faulty it may not throw an engine light for that part. Benz, BMW, jaguar share a lot of the same German engineering and bosh parts.

How do you locate a speed sensor on a SLK 230 turbine speed sensor is it out or is it in the trinity

Try cranking the engine while holding the accelerator to the floor. It may take a few seconds of cranking so be patient. This may purge any air from the system. Good luck

SPARK PLUGS FOULED OUT DUE TO LEAKING FUEL INJECTORS OR THE FUEL FILTER PARTIALLY CLOGGED.THAT WILL MAKE CAR HARD TO COLD START.

Replace the crank sensor (on the back of the engine, reads off of the flywheel). They have a nasty tendency to fail.

Let me understand that the problem is intermittent and engine is cranking but not started. For that being said, there are 2 main things to check.
1-The start is not on since there is not fuel delivered to the Fuel distribution. Fuel pump is controlled by the pump relay. But the pump relay is activated by the a fuel pump control module which is an electronics integrated module. This is the one gives unstable condition.
2- The start is not on since there is no electric signal to deliver to the primary coil. And this one is controlled by the ignition module. This is an integrated electronic module can give unstable condition.
The last thing to check is the Crank shaft sensor condition since it has to give the signal for the above 2 things to work. Good luck

hi,you my ask assistance from your dealer were to repair your radio