P0101 implausible signal
2004 Volkswagen Jetta 1.9 lt turbo diesel came in with a
P0101 mass air flow sensor code (implausible signal). The
vehicle ran but not well. There was black smoke on
acceleration and a noticeable missing condition at cruising
speeds. After visually inspecting and following all of the
testing procedures with no direct conclusion the final road
test and data capture measuring value block 93, channel 2 in
deceleration mode from approximately 2300 rpm to 1800 rpm in
5th gear. The desired value is supposed to be 0.95-1.05. The
charts for above and below have testing criteria which are
different if the values fall above or below the spec. Ours
was above, and as we already tested all of the listed
components we went looking for a mechanical issue and found
what you see in the pictures. Confirming repair directions
with the machine shop we sourced a rebuild kit for the head
and re-assembled it with new parts as needed. After priming
the engine and a oil change, the road test showed the issues
were solved. This just goes to show you that the codes you
see on the scanner (or the "dreaded" code readers) aren't
always the cause of the problem...sometimes it takes a wee
bit more work and a little more help than "Google" or
"you-tube" lol. By the way this was a BEW engine code.
Mark Witlox
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Vehicle Data2004 Volkswagen Jetta TDI 1.9L
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Vehicle Data
2004 Volkswagen Jetta TDI 1.9L
Engine | 1.9 L |
Trans | 5-speed Standard |