Can anyone help? I have a punto active 04 reg. The engine management light came on several times and Fiat garage said it was carbon causing the sensor to go faulty. After cleaning several times they agreed to replace the sensor. Four weeks later the same thing has happened. The engine is running well, mph is good and there is no lag in the pickup. The only thing I did differently was to go to another garage for petrol, any ideas any one please. And any ideas how you turn off the management light?