Aygo

[tonyg58]

This is so not a Pistonheads question, but would like an answer if possible.
Out driving the runaround Aygo last week and noticed that the change up/down indicator went from -

Advising change down
Off
Advising change up

With no change of speed/throttle position etc, but car did go from uphill to level to downhill.

Is there some sort of load or angle sensor in the car?
Any information appreciated.