SOURCE: P103 code in a 98 VW Jetta, 2.0 liter
THAT LEAK IS UN-METERED AIR ENTERING THE ENGINE, FIX IT AND RETEST SYSTEM. P103 IS A MAF CODE. A MAF MEASURES THE AIR ENTERING THE ENGINE, AND BASED THAT AND ON OTHER DATA THE PCM DECIDES THE AMOUNT OF FUEL TO INJECT.
SOURCE: 2003 vw jetta tdi fuel filter
It is on the passenger side right behind the washer fluid fill tube. You can follow the fuel lines (look like 1/4" black tubes, some are clear) from the injector pump to it. It is a caniser a bit bigger than a normal looking oil filter and sits between the washer bottle and the metal that forms the wheel well. It is held in by a screw type clamp about half way down the cylinder. Probably isn't the fuel filter unless there is air in the lines to the injector pump or they didn't bother to fill the fuel filter up with diesel after putting it in. There is not a fuel pump in the tank in these cars so everything is sucked up by the injector pump and it needs to be primed properly.
SOURCE: replacing mass air flow sensor in 97 vw jetta
If the mass flow sensor was bad, the check engine light should of came on giving off an engine code. To remove the mass flow, disconnect battery neg cable, then pull of the wire harness and pull out mass. You will probably have to remove the air intake hose.
SOURCE: 2000 Jetta 1.9 TDI is reading 2 codes for electrical connecton
The torque converter clutch circuit is built onto the tranny. You can see the plugin. You can disconnect this and will be ok, Otherwise it is expensive to fix
The crank sensor sends informaiton to car's computer telling it to give power to the motor. If the crank sensor is shot, then your car probably will turn over but won't start. Or won't always start until it is completely bad and won't start at all.
You can go to autozone.com and register for free, then you will have a full free online repair manual
SOURCE: p0106 map sensor code on tdi
02 jetta map sensor code p0106 and faulty boost sensor code p0238
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