Touareg V6-3.2L (BMX) (2005)
If the LED lights up:
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Replace the oil pressure switch (F1) --> [ (Item 6) , 20 Nm ] See: Oil Filter Housing/Service and Repair.
If the LED does not light up:
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Start the engine and run at idle speed.
LED must light up at 1.2 to 1.6 bar positive pressure, otherwise replace oil pressure switch (F1) --> [ (Item 6) , 20 Nm ] See: Oil Filter
Housing/Service and Repair.
Oil Pressure, Checking
Test Conditions
‹› Engine oil level OK, checking --> [ Oil Dipstick Markings ] See: Engine Oil Dip Stick - Dip Stick Tube/Description and Operation.
‹› Engine oil temperature at least 80° C (radiator fan must have run once)
‹› For vehicles with automatic transmission, selector lever must be in position "P" or "N".
Procedure
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Check oil pressure at different speeds:
‹› 1500 RPM: at least 1.7 bar
‹› 2000 RPM: 3.0 to 5.5 bar pressure
‹› Above 2000 RPM: maximum 7.0 bar
If the specified values are not reached:
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Examine the filter intake for contamination.
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Examine the pressure pipe between oil pump and cylinder block for tightness.
‹› Check for mechanical damage, e.g. bearing failures that can cause low oil pressure.
If a malfunction is found despite insufficient oil pressure:
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Replace the oil pump --> [ Oil Pump, Assembly Overview ] See: Oil Pump/Service and Repair.
The oil pressure must not exceed 7.0 bar.
If 7.0 bar is exceeded:
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Check oil channels.
Possibly the oil pressure relief valve in the oil pump is plugged.
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Replace oil pump.