Hi Craig

I had a 2001 Clio with exactly the same fault, unfortunately I do not have a fix as the customer would not pay for any further investigation.

I misunderstood the Snap On code decription.
I too cleaned the thottle body and checked the air temp sensor at the ecu plug and sensor, I could not fault the sensor or wiring.

On this particular Clio the fault occurred after a battery failure, the customer jump started it several times and changed the battery.
There is a metal surround near the positive battery terminal and I suspected the ecu was spiked by a shorted jump lead.

My conclusion was that the throttle body either needed re-adapting to the ecu ( if necessary ), or the ecu throttle driver circuits had been damaged by the previous jump starting.

I would be very interested in the fix for this fault as I hate a car leaving me not fixed .

Glyn