Question about 2003 Volkswagen Jetta TDI

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I have an 2003 jetta tdi 1.9 when the mass air flow sensor is plugged in it blows black smoke and sputters but when i unplug it it doesnt do that but i lose power

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I have exactly the same problem on my 2001 Audi A3 1.9tdi and have replaced the MAF with a brand new one from the Audi main dealer and this did not solve the issue at all. :( it seems like the common sense solution but does bot work!

Posted on Sep 10, 2011

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You need to replace bad Mass Air Flow (MAF) sensor !!!

Posted on May 26, 2011

  • Bastardguy Sep 10, 2011

    I have exactly the same problem on my 2001 Audi A3 1.9tdi and have replaced the MAF with a brand new one from the Audi main dealer and this did not solve the issue at all. :( it seems like the common sense solution but does bot work!

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Posted on Jan 02, 2017

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2003 ffv 5.3 chev suburban blows pcm 1 fuse with fuel pump ,mass air flow, evaporated purge , and pcm unplugged. Where do I go from here ?


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I have a 03 jetta when I stop at a red light or if I'm just parked it starts to shake what could that be??


Possibilities include:

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  • bad MAF (Mass Air Flow) sensor
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Changed the timing belt and knocked loose the wires or connections to the sensors on the mass airflow device.

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2004 jetta tdi, has engine miss & lack of power, has p0101 present, if unplugged has less power, but misses less, already cleaned extremely clogged egr valve, changed engine oil/filter, checked maf...


Running rough?? If i took a guess I'd say there's a faulty injector. Does it smoke like hell ?? Does it also miss at idle?- If so get a line wrench and a rag handy. Start the car and while idling wrap the rag around the base of the fuel line connector on injector 1 and crack it just a bit until fuel comes out. It might spray, thus the rag. If the miss gets worse, that ain't the injector to blame. Continue with the other 3. If you crack a line and there is no or very little change in the miss then you found the guilty party.

On a long shot it could also be a stuck valve.

Did that get it?? It sounds like an issue other than MAF but.... get a multimeter and try probing the connecter to the MAF. When you find out what it is , please let me know. I'm curious

*The key must be on*

pin 1- ignore it
pin 2- gnd = 12-14v
pins 2- 3 = 12-14v
pin 4- gnd = 5v
pins 3- 4 = 5v

P0101 - Mass Air Flow Sensor (G70): Implausible Signal

Possible Symptoms

  • Loss of Power
  • Erratic Idle
Possible Causes
  • Mass Air Flow Sensor (G70) faulty
  • Air Leak(s) after Mass Air Flow Sensor (G70)
  • Intake Air Filter dirty/faulty
  • Ground Spots corroded or Paint Residue
  • Wiring and/or Connections from/to Mass Air Flow Sensor (G70) faulty
Possible Solutions
  • Check Intake Air Filter
  • Check Mass Air Flow Sensor (G70)
  • Check Ground Spots
  • Check Wiring and/or Connections from/to Mass Air Flow Sensor (G70)

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My volkswagon 2003 jetta tdi doesn't have any power when you hit foot pedal going up a hill it doesn't have power to make it


check air filter. good chance it is clogged also the shut off valve could have serious carbon build up both of these items are easy to look at. also unplug the Mass air flow meter if power returns or is better good chance it will be that. which will have been killed by a clogged air filter.

Sep 04, 2009 | 2003 Volkswagen Jetta TDI

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2002 jetta tdi lost power and produced a lot of smoke from under?


when my 02 jetta did this, i had to replace the mass air flow sensor. hope this helps

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you have a bad mass air flow sensor. unplug the mass air flow sensor, the car will run normal if the sensor is bad

Jul 26, 2008 | 2002 Volkswagen Jetta TDI

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