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    Ross-Tech
    http://wiki.ross-tech.com/wiki/index.php/16705/P0321/000801
    16705/P0321/000801 - Ross-Tech Wiki
    16705/P0321/000801 - Engine Speed Sensor (G28): Implausible Signal Possible Symptoms. Engine shuts off; Engine doesn't start; Speedometer inoperative; Glow Plug Indicator Lamp (K29…
    Engine-Codes.com
    https://www.engine-codes.com/p0321_volkswagen.html
    P0321 Volkswagen Code - Ignition Engine Speed Input Circuit Range ...
    The P0321 code for Volkswagen vehicles indicates a problem with the ignition engine speed input circuit, specifically relating to range or performance issues.
    VW TDI forum, Audi, Porsche, and Chevy Cruze Diesel forum
    https://www.myturbodiesel.com/threads/p0321-engine-speed-sensor-implausible-signal.37251/
    P0321 Engine speed sensor implausible signal | VW TDI forum, Audi ...
    The P0321 code is stored in the ECM when the crankshaft position sensor signal does not meet specified measurements. The issue you reference could result from an intermittent probl…
    UK Volkswagen Forum
    https://www.volkswagenforum.co.uk/threads/p0321-code-crankshaft-sensor.6487/
    P0321 Code - Crankshaft Sensor - UK Volkswagen Forum
    When found in a VW Golf/Jetta (1J/9M) or Audi A3 (8L) with 1.9l TDI-PD (AXR), check TPI 2007067 which explains issues with electro magnetic interference. A modification to the wiri…
    OBD-Codes.com
    https://www.obd-codes.com/p0321
    P0321 Ignition/Distributor Engine Speed Input Circuit Range / Performance
    P0321 indicates a problem with the ignition/distributor/engine speed input circuit range or performance. Learn the symptoms, causes, and diagnostic procedures for this code, which …
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