View source for 16485/P0101/000257

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== 16485/P0101/000257 - 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)
* Excessive restrictions in the Intake/Exhaust System
** Dirty air filter, clogged snow screen, clogged CAT
* 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)

==== Special Notes ====

* In MY 1995-2002 (?) in Europe at VW-diesel-cars G70 had the bad reputation of slowly losing his performance, causing loss of power. It's not a matter of defective or breaking down, but it is filthy / dirty (not easy to clean). You can check functionality by making a log in [01-engine], [meas.blocks-08], group 003 (3e gear, full throttle, from 1700-4000rpm)
* It is not uncommon for a TDI to set Implausible Signal Mass Air Flow Sensor (G70) faults when the engine performance is reduced due to a mechanical problem. These mechanical problems may include, ''but are not limited to'':
** Faulty electric fuel pump or Restricted fuel filter. See the [[Fuel Pump Basic Settings for PD, PPD, and CR TDI Engines]] page for Basic Settings tips after replacement.
** Excessive restrictions in the intake/exhaust system
** Internal camshaft/valve/lifter problems


[[Category:Fault Codes]]