I have a 1999 1/2 vw jetta tdi. When I go over 1400 rpm the oil light come on, once I go back to idle speed it goes out.
Sounds like the Oil Gauge sensor or level unit.
Skip the sending unit issue, you've replaced the major parts..I did some research and spoke with my Tech here were I work...sounds like the voltage regulator might be triggering your light to come on due to excessive voltage upon accelerating or reving the motor. He had the same issue on his new Beetle.
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When last oil change ----check level----pump pressure----oil filter --oil pressure sender/sensor
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I have changed the sensor and oil pump, still does the same thing. What do you mean by "level unit".
My 01 jetta 280 +K is doing the same thing, after locking my keys in car while idling called popalock took two hrs, when got in oil light prob started changed sender, full crankcase flushed engine, now going to drop pan, don't know....
dave (jacker to year 09) step one in any true shop is:
shop oil pressure gauge in hand
we test the real pressure GAUGE(hand) not guess
run correct oil 10w-40 might help
new oil filter never let it go to bypass mode ever, keep it fresh.
oil level never too full (over H mark is)
do the simple things first no drop pans/
see if the pressure really is wrong.
and if is correct. then the sensor added is the wrong sensor used of vast.
most oil lamps glow below 5-7psi
and if is REAL is not good.
the pump has pressure bypass valve
that some can be reached easy
and replace, if it sticks open this valve expect H3LL to pay./
my valve shows 55psi even cranking cold engine,spark and fuel fuses pulled.(a test )
if the valve fails here all, tests fail
hot and cold tests.
no real VW engine name told
TDI of some kind
, 1.9L ?
chain driven pump
if pressure is so low most engines
valves make a huge racket. or chains
the turbo checked for oil leaks. at bearings (smoke?)
turbo can fail and cause oil gallery pressure to fall.
finding the location of the gallery leaks takes hard work
valve cam/rods, mains, turbo
locking keys in any car running
car causes the engine to overheat.
so test the car only after it fully cools down/
always have 2 fobs or other member of family has it to help you.
we have 4 keys 2fobs + 2 button less fobs. (all IMMO ready)
good luck finding this.
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