UK Auto Repair Questions?
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Error code 227956 does not necessarily mean that the EGR valve is defective.
It merely indicates that there is an air leak somewhere. Often it is the EGR valve, but not always. Check the intake manifold between air filter and manifold for leaks.
If this is ok, carefully open the oil filler cap while the engine is running. There must be a slight overpressure (be careful there might be some oil splashing and the engine starts to stutter). If there is so much negative pressure on the engine that you do not get the cover off at all, the crankcase vent valve must be replaced.
If this check is also ok, then the MAF sensor must be replaced.
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No, this is not correct, in case of a defect of the air mass sensor the performance is limited, but the engine runs normally and not rough, not even at idle speed.
There is CO2 leak detection spray. With this you spray along the intake tract. If there is a leak, the engine starts stuttering when you spray this spot.
Yeah, that's what's on the line going from the engine to the intake manifold.