Where is oil pressure switch on vw passat 1.8T 2001 Y plate?. and how do i change it?

i would replace the oil pressure switch there about $30 they fail more than computers

Its big problem your vw engine head gasket is faulty !!! It must be changed !!!

CHECK ENGINE OIL LEVEL SOUND LIKE LOW OIL LEVEL.CHANGE OIL IF IT HAS BEEN OVER 3000 MILES OR OIL LOOKS DIRTY CHANGE IT.IF OIL CHANGE DONT HELP HAVE OIL PRESSURE CHECK TO SEE IF OIL PUMP GOING BAD OR YOU HAVE A FAULTY OIL PRESSURE GAUGE.

many reasons it could be
low oil pressure due to low amount of oil
bad oil sensor
worn bearings internally inside the motor
worn oil pump

Hi before you do an oil change try seafoam in the engine oil. this can sometimes fix the problems you are having, I used seafoam in engine oil and fuel and breather line and ran engine for 100 miles, but don't run hard, and its cleaned all the sump and oil veins in the engine, as checked with a scope looking though the oil sump plug. it did a really good job, my engine is a bit older than yours 1994. oil sensor is at the bottom of the engine on the sump. pressure sensor is above the oil filter it has a single wire conection

oil pressure should be atleast 18 psi @ idle on the engine however i think you have a weak/faulty oil pressure switch as well

Gasket need replacing and New Spark Plugs (NGK Orginal). May need Coils! If any, replace all at once, My 2000 Passat Wagon runs Great, 1,8T Wagon!

which motor ? the V6 has to be done from bottom but most others can be done from under hood

oil pressure low, check oil level.

ya honestly just fixed that on my 1993! its not a big deal but u got to break it lose with a 24mm deep socket and it works!