what does this code mean p1518 on 2002 Ford Focus SVT

what does p1518 this is what i got when i put it on the comp

Asked by for the 2002 Ford Focus SVT
It means...intake manifold runner control malfunction.

From the shop manual:
The IMRC system is monitored for failure during continuous, key ON engine OFF or key ON engine running self-test. The test fails when the signal on the monitor pin is less than an expected calibrated range at closed throttle.
How do I fix it?is it going to hurt the engine?
It's not a simple diagnosis and repair; I do recommend a technician look at it - one versed in the operation of this system (IMRC).

Check engine lights indicate emissions and performance issues - I would say that it is something that requires inspection and repair.