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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
 
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Your fault code is for the lambda sensor, but if the ECT is giving a wrong reading and overfuelling, then that would cause that fault.
Temp senders are cheap as chips and easy to fit, so start there
 
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