The turbocharger is a delicate device that may be seriously damaged by improper lubrication or introduction of foreign matter into the air intake duct, and the results are usually manifested by a malfunctioning engine, blue/grey smoke in the exhaust, or unusual sounds. In order to diagnose possible problems, check the intake air duct whether it is loose, ruined, in any case there are no obstructions in air intake system and also look at the system vacuum hoses, wiring and electrical connectors whether they are damaged or corroded. Also check that the wastegate actuator connection is not binding and check the exhaust system, lubricating oil supply line and drain back line, and coolant supply line and coolant return line has no damages or blockages. In case of replacement, empty the cooling system, lift the car up and take out the engine compartment cover. Disconnect the air conditioning compressor, without disconnecting the refrigerant hoses and remove the turbocharger support bracket and the air inlet and outlet ducts, oil return pipe and oil supply pipe. Also, detach the vacuum hose to the wastegate actuator, the air filter housing and air filter duct, and loosen the crankcase ventilation hose. Once the turbocharger has been removed, it must be installed in reverse sequence, with all the gaskets, seals and nuts turned over, and the mounting bolts of the turbocharger fitted to the correct torque. Remember to take off the fuel pump fuse before proceeding to start the engine until the pressure of oil develops. In the case of the intercooler, lift the vehicle up, undo the engine compartment undercover, undo the air deflector, and undo the upper and lower air ducts and remove the mounting bolts after which the intercooler can be removed and re installed in the same sequence.