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Symptoms of a leaky/bad Volkswagen heater core?

The smell of coolant coming from your vents when the heater is on, an unusual  amount of fogging of the windshield, and in some extreme cases, coolant will leak into the inside of the car
Volkswagen oxygen sensor light has turned on

Change the oxygen sensor, and reset the oxygen sensor light. Oxygen sensors are to be changed every 30k/60k miles depending  on your car.
How do I reset the oxygen sensor light
The oxygen sensor light is attached to a small odometer which trips a switch every 30/60k miles. To turn the oxy light off, you have to reset  that odometer. VW has two locations for this unit: Either somewhere along  the speedometer cable, or as part of the instrument cluster.
For A2 Jettas & Golfs: Remove the coolant reservoir to locate the box with the  white recessed switch. Push it in far until you hear a satisfying click. You should only need to push once. The "box" is black, and the speedometer   cable passes through it.
How do I take care of my Volkswagen to make it last ?

   - Check fluids often (oil, coolant, PS fluid, brake fluid, battery)
   - Follow recommended maintenance
     Change oil & filter 3000 miles/5000km or 7500mi/12000km with synthetic oil
     Use the correct weight of oil for the climat
     Change coolant when it looks dirty (or every 2-4 years) and use phophate
     free coolant mixed with distilled water
     Bleed brakes yearly. Use Dot 3/4, Dot 4 or Super Dot 4 fluid
     Change fuel filter (at least every 30k miles or 50k km)
   - Use OEM, MANN or Bosch filters.
   - Change the oxy-sensor at the recommended interval (if you don't
     you may burn your cat. converter which is A LOT more expensive to replace)
   - Reset mechanical trip odometers when the car is stationary
   - Warm up your car by driving gently until your oil temp is 80C
   - Check your CV boots for breaks often and replace as soon as they crack
     (this will prevent having to replace the whole joint)
   - Use fuel injector cleaner every couple months
   - Check tire pressures periodically. It's better to over inflate than to
     underinflate (I run 40 psi on my G60 with little effect on wear)
   - Garage the car, leave it out of the sun
   - Replace all gaskets and seals if you take something appart.
     It's a small cost in comparison to the cost and time to take
     something appart
   - Cars with solid lifters: Adjust valve clearances as recommended
     (if you don't, you may burn your valves).
   - Replace all belts every ~60k miles/100k kms
   - Replace all hoses every ~100k miles/160k kms
   - Replace vacuum hoses as they get stiff and brittle
   - Learn how to rev-shift to save clutch wear
   - Check transmission level periodically. Familiarize yourself
     first what that level should be for you car.
   - Stay away from low quality parts, especially for CVJoints and axles
     Do not use remanufactured parts, only OEM
   - Run your AC at least once a month for a couple of minutes
     to lubricate the bearings and prevent the seals from drying out
Volkswagen starts fine but hesitates at cold. Runs fine when warm.

   Rough running at cold can be caused by a bad coolant temp sensor. On 8V engines the sensor is generally found on the coolant flange bolted to the head and going to the radiator upper hose. On 16 V Jettas it's next to the coolant outlet at about the 7 o'clock position on the rear of the head (tranny end) the sensor is a 2 wire unit
Where are the timing marks on A1 & A2 Volkswagens?

     At the top of the clutch/bell housing you will find a plastic plug. Pulling
   the plug allows you to use a magnetic factory sensor. If you want to use a
   strobe, you will have to *unscrew* the whole plug assembly. Then you'll see
   a reference mark, and an arrow somewhere on the flywheel:
Volkswagen
Volkswagen engine knock/pinging/detonation

  Too much timing advance. Check Timing. Also check VALVE timing. Too low gas octane/too high engine compression. Engine overheating. Carbon build up on valves. An improperly torqued knock sensor can cause the sensor to not
function correctly resulting in knock and/or loss of power. Failing knock sensor.

 
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