a flickering check-engine light (code 2111)

Phil Rose pjrose at frontiernet.net
Tue Jul 8 16:01:51 EDT 2003

So far (today's driving) the problem has not recurred, and I'm now
getting the all clear "4444". I will follow your advice if/when it
ever happens again. Thanks.


At 2:04 PM -0400 7/8/03, ben swann wrote:
>It may not be a false reading.  But the sensor is not necessarily bad,
>but may need cleaning.
>Remove the sensor - can do both rpm and speed sensor at same time by
>removing assembly.  Clean all the crud and metal filings off that have
>managed to stick to the magnetized sensors and housing over time.
>That fixed mine on both 5000 tq and 200 20v tq.
>Make sure the allen key/socket used is a tight fit.  May need dosing
>with PB Blaster/Liquid wrench or other favorite bolt busting oil.
>[Date: Mon, 7 Jul 2003 21:31:16 -0400
>To: 200q20V mailing list <200q20v at audifans.com>
>From: Phil Rose <pjrose at frontiernet.net>
>Subject: a flickering check-engine light
>started this morning. The light flickers briefly (numerous times for
>just a second or less, each time) while driving. It appears to be
>related to abrupt chassis movement (driving thru potholes, bumps,
>etc.). The ECU fault code is 2111 (engine RPM sensor). This value is
>seen while engine is *running*, so it's evidently not just that
>"false" 2111 that is commonly seen when reading codes with the engine
>stopped. The light flickered during just the first 30 miles of our
>drive today but then was OK (no light) during the last 120 miles of
>the trip.
>I have now done all the specified electical tests at the speed sensor
>connector (a la Bentley), and everything so far checks out OK (I've
>not done the continuity checks back to ecu--ugh).  Also I guess it
>wouldn't hurt to clean up the manifold ground connections. Anything
>else possibly causing this symptom?
>Phil Rose
>Rochester, NY
>pjrose at frontiernet.net]


Phil Rose
Rochester, NY
mailto:pjrose at frontiernet.net

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