A 12V 11W coil will take about 0.9A so the resistance should be about 13 to 15 ohms. However it's not an exact art with coils so 10 ohms isn't too far from the ball park although a little low. Best way to test it is remove the coil (should be a clip, nut or bolt holding it onto the solenoid post) and power it up with 12V either from the battery or a power supply, battery charger or similar.
Then get a steel bladed screwdriver and introduce it into the central hole where the coil would normally have the solenoid post. It should be pulled in if the coil is working.
Note that some solenoid coils have built in "flywheel diodes" to prevent back emf reaching the ECU when the power is removed. These appear to be connected back to front across the coil, this is normal but depending on your multimeter and which way you connected the leads from it, the flywheel diode could alter the measured resistance so try checking it again with your meter and check it reads the same both ways round. If one way it reads higher then the meter was probably measuring the combined resistance of the coil and flywheel diode and giving a lower reading, in which case take the higher reading as the coil resistance.
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