[bagster]

hi i have just purchased a megane 2 03 plate 1.6 16v and it wont idle from cold at all. it starts fine runs for a couple of secs then stalls, keep starting till warm then its fine. It had no engine man light on at first then after 150 miles it alluminated, i put it on a OBD 2 and the fault " Powertrain H02S circuit bank 1 sensor 2 came up.... Any ideas would be grateful.... Thanks all

 

[danthevan]

Obvious thing to change would be the coolant temp sensor. The code you have looks like probably the lambda sensor, which if the ECT sensor was overfuelling could make the lambda play up.

 

[bagster]

Thanks, also there is a funny little Rattling noise that comes only with the lenth of the starter throw from cold . Cheers