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You must now get the system scanned for the fault code that was set when the light was turned on by the computer control module. This is called an OBD2 fault code test.
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could be sender or pump. do not run the engine until you're sure you have a good pump. Does it blink on and off--coming on mainly at idle? This would be normal for an old engine. If it stays on and the pump is bad, you will ruin your engine. You can try replacing the sending uniot, as that is cheap compared to the pump, but don't run it long to check new sender. If new sender stays red, shut down and replace pump.
Check the load reduction relay. I had this happen twice and repaired twice on my TDI mk IV. It throws no codes and almost has to be witnessed by a mechanic to be believed.
That's the motor-management warning light. Meaning: serious errors are being detected by the motor-management computer (= ECU). You should have a dealer readout those ECU faultcodes using VAGCOM to determine the cause a.s.a.p, before (more) harm is done to the engine.
Please be aware that your motor could also switch to "failsafe" mode when too many severe errors are detected, meaning it's terribly slow to drive and turbo-pressure is nearly non-existing.
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