Getting really pissed off now.

[piggoy]

Exact same thing here - started a new thread

Car goes into limp mode with ECU light and emissions light. Nearly always happens when decelerating hard for a r'bout. Switching the ignition off and then on cures it for a few minutes. Diagnostics at my local garage showed up nothing :S

 

[ianysm]

Mine turned out to be a new throttle pedal and thorough clean of throttle body