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Often an error is produced the car will switch to "limp mode" in which case it opens up the wastegate and no turbo pressure is sent to the intake manifold.
Common problems which will cause this:
The blow-off valve (or diverter valve) is manufactured to withstand 1 bar (14 psi) of pressure. On a stock setup this is the pressure that the turbo supplies. However, the blow-off valve still fails. Inside it has a rubber membrane which at some point will tear. The company that makes the blow-off valve is called Piersburg, and they make blow off valves for VAG (Volkwagen Audi Group) and these blow-off valves can be found in a range of VW, Audi, Skoda and Seat models. The blow-off valve in the VAG cars are manufactured to withstand pressure of up to 2 bar (28 psi) which makes it perfect for the Prince unit's problem. The entire VAG unit will not fit on the original turbo, but the internals will. All that is required is to exchange the original valve's internal parts with that of the VAG unit's.
There is another valve called a "Depollution Canister Valve". The purpose of this valve is to control the burning of petrol fumes. Because petrol is a volatile substance it will evaporate easily. This means that there will be some sort of pressure building up in the fuel tank. To release this pressure, a valve is fitted on the intake manifold pipe. However, this valve only opens when coasting; i.e. when turbo boost is not needed. But, when turbo boost is produced, this valve needs to close. Failure to do so will mean that the turbo boost will be sent to the fuel tank and not reach the intake manifold side of the engine. When this happens the ECU will automatically read this as a problem with the turbo. These valves sometimes do become a bit dirty resulting in the valve's piston becoming stuck. Unfortunately, there is no way of testing this valve and so the only way to figure out whether or not this part is faulty is by replacing it. In other cases, this valve can be reset by disconnecting the battery for 20 minutes immediately after switching the car off. But if the valve is really stuck, this will not fix the issue.
Yet another valve can cause major problems. The Boost control valve sometimes also stops working, which will cause excessive boost, or no boost at all. Replacing this part is also far cheaper than replacing the entire turbo unit.
The car's computer controls the actuator, and the actuator control the wastegate. Sometimes, the nuts holding the actuator's arm in place comes loose, resulting in a fully opened wastegate, meaning no boost will be produced. Solution, tighten the nuts; or, if they are missing, simply purchase new nuts and tighten the arm.
Also, if the "Depollution Error" fault is produced it can be cleared by disconnecting the battery for 5 minutes immediately after switching the car off. If the error returns the car will have to be checked out by a service center.
The engine's are known to burn oil in quantities near 2L per 3,000 mi. This is further complicated by a poor tension drive system. Insufficient lubrication on cold start elongates the timing chain. This has mostly notably been present on the R56 Mini Cooper (2007-). BMW refuses to remedy the design flaw and has instead issued a Technical Service Bulletin (TSB SIM 11 02 07)[7]