
Remove the cylinder head cover (see "Adjustment of thermal clearances in the engine valve mechanism")

The crankshaft position (timing) sensor type (2612.1.113 BOSCH or 406.3847113) of the inductive type is designed to determine the angular position of the engine crankshaft, synchronize the operation of the controller with the engine's working process and determine the crankshaft speed.

If there are signs of oil leakage through the crankshaft seals, first check if the crankcase ventilation system is clogged and if its hoses are pinched, repair if necessary