Vw polo 2002 heat gauge goes rite up and sometimes down to 0

Either you have a faulty oil pressure switch or the pick up screen of the oil pump is clogged. I would change the switch first as it's 10 bucks not expensive then go on from there

What does the radiator coolant temperature gauge show when you have this condition? For example is the gauge sitting around the 8/10ths level or is it lower?

does the temp gauge reach the red area? check eng coolant .Over heating could cause eng to cut out so as not to cause more damage check the cooling system.When travelling slowly or at stand still turn heater to max heat and max speed this will cool eng but is only a temporary solution

try installing a new brake light switch ref. haynes repair manual for vw 98 - 2002.

Visit the on-line store, known as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
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if car is not getting hot no problem to drive

90 is the correct temp for this engine,if it goes right down then consider the thermostat faulty.if it goes higher...... (dont even think about overheating)YET.

Hi,
It is a wiring fault, but they are looking on the wrong end. You will need to have a VW dealer "repin" the electrical connector at the throttle body. What this means is, the dealer will take apart the connector, cut off the old pins and crimp on new ones and reassemble the connector. This is a common problem on drive by wire VW's. The dealer has a bulletin on the problem and I don't know why they missed it. They will probably have to order the connector kit however. Good luck!

You may be just low on water. Check your water level and top off with antifreeze.

Bought a very reputable diy service manual for the vehicle, and that plus a bit of thought and nous gave me the cure: no intrinsic problem other than loose relay connections. Went round with the wiring diagrams as guide checking all electrical connections in tight and relays fuses etc all good. Switched on and no problem any more.

By the way, vehicle is 1992 VW Polo - not Fox (which in UK is a variant of the Polo)