This is the second time I have come across this fault in as many months, this time the car came from another garage after they had fitted a coolant temp sensor and the fault had returned,
The customer had complained the coolant fan was staying on the fast speed all the time even after the ignition was turned off for approximately 30 seconds
As you can see the fault code P11AA is pointing to the inlet manifold pressure sensor, the first time I came across this it made me think, anyway this is the fault
and this is the fault sorted
It was only the oil filler cap not fitted correctly just one to think about, could save you a lot of time and your customer some money