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what does this code mean p1518 on 2002 Ford Focus SVT

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