Warm up the car engine to an oil temperature of approximately +80°C.
The hydraulic oil pressure switch is located in the oil filter housing. Loosen the bolt -2- and remove the oil filter cover so that the oil flows into the engine. There is also an alternative version screw cap oil filter.
Disconnect electrical cable from hydraulic switch and unscrew hydraulic switch -12-.
Screw in a suitable pressure gauge instead of the hydraulic switch.
Replace the filter cover.
Start the engine and leave it to idle. The oil pressure for all engines must be at least 0.5 bar.
Increase the crankshaft speed to 5000-6000 rpm. In this case, the oil pressure must be from 4.0 bar (for diesel engines from 3.8 bar) up to 4.7 bar.
Reinstall the hydraulic switch with a new seal and tighten to 20 Nm. Connect the electrical wire to the switch.
Tighten the oil filter cover to 20 Nm.
If the oil pressure does not correspond to the prescribed values, see chapter "Oil Circulation Troubleshooting".