Had this with 2004 16v clio. Got a fault reader off
for £20 and looked for myself. Reader came up with 2 faults, throottle pedal potentiometer and lambda sensor.
This is what a garage had diagnosed 3 days earlier and had supposedly cured.
Got to thinking that problem did not lay with either of these so checked loom at
. No broken or chafed wires so looked at the relay and fuse box on left hand side by the battery.
All the fuse and relay terminals were dirty or corroded and tarnished so I cleaned them all up with some fine emery paper.
Also cleaned up the battery terminals.
Reset the fault codes and all been fine for 2 months now. Checked the fault codes on the reader the other day and no faults showing. Car runs like a dream so fingers crossed. My thinking is that the dirty terminals could have reduced the voltage to various sensors and given a false reading to the
which would have registered a fault and then gone to limp home mode.