The oil pressure switch at the head is the low pressure switch.
The oil pressure switch at the filter flange is the high pressure switch.
The low pressure switch causes the light to blink when the key
is in the ON position, or when oil pressure is less than 0.25bar
at low engine rpms.
The high pressure switch causes the light & buzzer to come on when
the engine is running and oil pressure is less than 1.8bar at 2000rpm
One the 1.8 & 2 liter engines, there is no control valve in the
filter mounting flange.
Oil pressure is controlled by the pressure relieve valve in the
Saturday, March 31st, 2012 AT 4:32 PM