Audi Workshop Service and Repair Manuals > A4 Mk2 > Power unit | 4-cylinder TDI unit injector engine (2.0 ltr. 4-valve), mechanics | Engine cylinder head, valve gear | Removing and installing cylinder head

Checking compression

To check compression, select function “Self-diagnosis compatible systems” in “Guided Fault Finding”.

01 - Self-diagnosis compatible systems
	01 - Engine electronics -J623-
		01 - Subsystems, background conditions
			Compression pressure test

–	Check compression via “Cylinder-selective engine speed”.

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