H i all , my son has just bought a 2004 1.2 8v punto thats developed an issue when idling it is a little rough we have serviced it but no change , plugs are sooted , pluged a diagnostic in and it showed p0141 which we believe to be the down stream lambda sensor . we found the sensor to be loose so took it out cleaned it and replaced it but did not remove the fault so will get a new one to hopefully sort the problem . We did notice that the ecu light is not working when ignition is switched on so leads me to think someone has disconected it to hide our initial fault , i believe the ecu light is an led soldered in so is there an easier way the light can of been disabled ? thanks for reading Russ