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What year is your car and how many miles has it done ? A google search suggests you have a problem with communications from the AM6 gearbox to the ecu. if the codes are cleared do they come back again ? Maybe there is a bad wiring connection that needs cleaning up or a broken wire. From here the codes give http://c4owners.org/C4_Error_Codes.php P1605 Engine torque required by the driver information not received by the CAN fault (Engine ECU) : Not characterised P1727 Fault on the actual engine torque information not received by the CAN (Engine ECU) : Not characterised U1208 Fault in the information transmitted by the engine ECU : Value received incorrect As for the hose that is sucking in, maybe it needs replacing if it has gone soft and also possibly the air filter is blocked and needs replacing. You could also check for any restrictions in the air inlet piping and if the intercooler is full of oil from a worn turbo.