OBD-II code P1530

Can anyone tell me what OBD-II code P1530 means on a Boxster? The generic description is idle problem.

what year? engine?

It is a 1997 Boxster

your ecm is seeing too low, too high, or an erratic idle problem. check for vacuum leaks. your going to really have to look as there are alot of vacuum lines hidden. also give it a fuel system clean.

how does the car run and drive? does it idle high, low or erratically?

The idle is only rough if the A/C is on. With the A/C off it runns great but still generates the 1530code.

the idle motor is not working. when the a/c is on the idle should kick up ~100-150 rpm. your engine is going to run rough because the a/c is putting a load on the engine and the only way the engine can compensate for the extra load is by raising the idle. clean out the idle air control motor and if that doesnt work, replace it.

Thanks. I'll check it out. Somewhere I read that a rough idle can be caused by an A/C unit that is overcharged from the factory. Any thoughts on that possibility?

possible but unlikely as there is a high pressure switch that will shut off the a/c in case of high pressure.