Aha! I know this one...

It happens on mine when the air being taken into the engine is in excess of 60C. This happens when the engine is warm (after a long run or heavy use) and when you come to rest the residual heat in the engine bay warms the air in the intake system. Whether this code shows or not is also dependent on the weather - sticky, humid weather seems to make the code more likely to register.

One of the first times this happened to me was when I'd driven into a long, narrow car park with a large trailer behind me and then had to reverse back up the car park, turn around and reverse back down. All of the shunting in reverse and straightening up was hard work and there was no airflow through the engine bay.

Its very much an "intermittent" code and can be cleared as soon as the pocket of hot air has passed through the intake system. The temperature just seems to confuse the ecu somewhat...

Hope that helps,

Alan