My 2004 986 is showing the "Check Engine Light" and a rocking, rotating light/indicator runs back and forth between high and low gears. This is an automatic transmission. An engine sensor read out says "Transmission shifter solenoid circuit malfunction". I cannot find anything on line about repairing this. Any one have a clue please?

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This is a fault code for a solenoid in the transmission. You will need a Porsche scann tool, the wiring and test tools to diganose it. You'll want to operate the solenoid with the scan tool and see if it is actuating. If not, then check the control signal to the solenoid.

- Nick