P2181 is a overheating engine.
Can be:
Bad fan themoswitch, temp sensor themostat water pump impeller fan motor or fuse on battery
check to see if fans work by turning on Air Conditioner (fans should run with A/C on). Turn A/C off, warm engine, check to see if fans come on, if they do NOT it may be thermo switch on radiator on lower left side, has 3 wire plug, takes 1-1/8" wrench/socket to remove. This thermo switch controls fans when temp reaches 195F, if fans do not come on at engine temp 190-195F try replace switch VW part number: 1J0-959--481-A You can verify if the switch is bad by shorting wire 1 and 2 (fans should come on when jumpered).
Trouble code P0811 means: Excessive clutch slippage
The 2003 Volkswagon Jetta OBD 2 port is "in cavity at bottom of dash, between steering column & kick panel"
cooling system performance. check the temperature sensor, thermostat and water pump. Could be one or a combination.
replace spark plugs @wires
Trouble code P0501 means: Vehicle Speed Sensor A Range/Performance
The 2002 Volkswagon Jetta OBD 2 port is under dash at left side
I have the same code on my 2003 accord.
The 2003 Dodge Grand Caravan OBD 2 port is on lower edge of dash above parking brake pedal
The OBD II connector is what your looking for on Jetta III models remove the ash tray then slide the pannel to the right of the ash tray over the ash tray opening.
it is number 2
You need a factory scantool or aftermarket scanner that will read transmission codes. A basic obd code reader at parts stores will not read transmission codes.
What does obd code P0740 mean