I have a 06 Sebring and it turns over and runs with the key in the on position.

Start by removing the two lower shroud screws and remove the upper and lower steering column cover.
Look along the lower casing of the lock cylinder housing and you will see a small (1/8") hole with a pin in it.
Put the key in the cylinder and turn it to run. While in this position, push the pin into the lock cylinder and pull the key and cylinder out.
To install, turn the new key in the new cylinder to run position and slide it into the housing. To lock it in place, turn the key to the off position.

Did you do the key "Dance" for codes? Put key in ignition, turn to the "RUN" position - do not crank the engine - and return it back to the off position, do this four times, on the fifth time leave it in the "RUN" position and watch the check engine/power loss light and count the flashes. Should start with five flashes (start of test) followed by a couple series of flashes keep track of the number of flashes as this will tell you what sensor is on the fritz. The test is over when it flashes five times again. Also the chain stores will scan for zero cost.....Just for grins try unplugging the water temp sensor (usually near the thremostat) see if car stays running......Plug it back in to double check.

Hi there:

DTC P0725 - ENGINE SPEED SENSOR CIRCUIT

When Monitored: Continuously after a ignition key is turned from the OFF to RUN

position and/or key is turned from the CRANK to the RUN position.

Set Condition: The code is set when the engine speed sensed by the Transmission Control

Module (TCM) is different than the engine speed reported by the Powertrain Control

Module (PCM) over the Communication Buss.

POSSIBLE CAUSES:

CHECKING SYMPTOMS AND POSSIBLE CAUSES

LOW BATTERY VOLTAGE

BAD CONNECTIONS AT VARIOUS CONNECTORS

CRANK POSITION SENSOR SIGNAL OPEN

CRANKSHAFT POSITION SENSOR GROUND CIRCUIT OPEN

TCM CRANK POSITION SENSOR MONITORING DEFECTIVE

Hope this helps.

try setting the odometer to read the trip miles. Then turn the ignition key to the off position. Now while holding the trip meter reset button in, turn the ignition key to the run position ( not cranking the engine just until the dash lights come on). The dash should go into a reset mode. You can release the trip reset button while the dash resets itself, should take less than a minute to complete.

Have you checked the fuses? There should be a fuse box under the hood open the box the diagram inside will show what fuse is for the ignition. Pull the fuse and hold up to the light the little wire inside should have no break between the two posts of the fuse. Don't forget to check the fuse panel inside the car also there should be a secondary ignition fuse in that panel also.

first thing to try would be to remove car from park to a gear and then put firmly back into park...... then retry,
if doin that a few times dont work, you will prob need to replace the ignition cylinder....... make sure it appears gear selector levers parts are all in their place,, visually that is

wires have got lose

Go to the dealer with the VIN and they can cut a new key to fit the original cylinder.

TWO THINGS TO TRY... FIRST DISCONNECT BATTERY. LEAVE DISCONNECTED FOR TWENTY MINUTES, WHILE DISCONNECTED TURN THE IGNITION KEY TO THE RUN POSITION AND LET SIT...AFTER 20 MINUTES TURN KEY OFF RECONNECT BATTERY.. THEN TRY IF STILL NOTHING, THEN TRY TURNING KEY TO THE RUN POSITION AND LEAVE FOR 10 MINUTES.. THEN TRY IF STILL NO THEN GET BACK WITH ME FOR FURTHER INFO

YOU TURN IGNITION TO RUN POSITION..ENGINE OFF..PRESS ACCELERATOR 3 TIMES WITHIN 10-15 SECONDS..RELEASE AND TURN KEY OFF..THEN START VEHICLE,IT SHOULD BE RESET