Q: Smell of petrol and white smoke from exhaust Peugeot 207 Sport

Hi there - I think there are perhaps 2 problems here. the excess fuel, white smoke issue is not likely caused by a cam phaser problem. This seems more like a rich fuel mixture issue - leaking injector(s), or malfunctioning coolant temperature sensor. Cam phasers are somewhat expensive, and require re-timing the camshaft(s) to the crankshaft, a tedious procedure requiring special tools. I would ask the mechanic to distinguish between these 2 different sets of symptoms. For a trusted 2nd opinion, I recommend an engine inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.