Fiat Punto 2003 1.2 8V P0135 P0141 P0340 Marelli ECU, the car runs fine but has failed the emissions fault codes are as above relating to the lambda heaters but with ignition on 12V at PIN 4 engine running switched to earth on PIN 3 yet the fault codes say preheating resistance 1 above catalyst and below but they are clearly working when you hold them they get hot I'm thinking ECU faulty my local dealer says they were changing 20 a month in the UK a couple of years back hay anyone else had this problem.
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