Curious if my car is broke or if this is normal. It only turns off sometimes at stop lights. Other times there is a yellow light that comes on. How come it doesn't shut off every time Im stopped?

 

I hope this isn't a dumb question but....

Have you read your owner's manual about how it works?

 

http://www.porscheownersmanuals.com/...nction-Display

Engine does not stop or is not ready to restart
If the Auto Stop function is not available or if no driver is detected in the vehicle after the engine has stopped automatically (driver's safety belt open or driver's door open), the indicator light on the multi-function display of the instrument panel will light up yellow when the vehicle is stationary.

The Auto Start Stop system has detected that:
At least one precondition for stopping the engine automatically is not met. or
There is at least one exception for the Auto Start Stop function.

Preconditions for stopping the engine
Auto Start Stop function switched on.
Engine compartment lid closed.
Driver detected: driver's safety belt fastened and driver's door closed.
Tiptronic S selector lever in position D, N or P or transmission range 1 or 2 selected manually.
Engine, transmission and battery are at operating temperature.
Vehicle was driven at a speed of more than approx. 1 mph (2 km/h) for at least 1.5 seconds since the engine last stopped automatically.

Exceptions for the Auto Start Stop function
The Auto Start Stop function is not available in the following situations, for example:

When Sport mode is activated.
When PSM is off.
In Maneuvering mode.
When AC MAX mode is activated.
When the "windshield defrost" function is active.
When an attached trailer is detected (trailer connector plugged in and trailer detected).
After the ignition is switched on, the message "Start/Stop mode deactivated" will appear on the multi-function display in the instrument panel.
While adjusting the chassis level.
When the rear fog light is on.
When the off-road driving program is active.
When windshield heating is on.
At altitudes of more than approx. 2500 m (Cayenne S, Cayenne Turbo and Cayenne Turbo S only).

 

Thanks Matt. Its been in Sport mode which was my issue.

 

Anyone logged the MPG difference when using this? Just curious.. I never turn mine on.