DTC Code P1320 – What does this code mean for Volkswagen?

<ul> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: The illumination of the engine light indicates a detected issue within the knock sensor circuit. This can be caused by a short to ground in the knock sensor 2 circuit.</li> <li><b>Poor Engine Performance</b>: A malfunctioning knock sensor can lead to improper ignition timing, resulting in reduced engine performance. This can be due to the knock sensor 2 circuit being shorted to ground.</li> <li><b>Increased Fuel Consumption</b>: The engine may run less efficiently, leading to higher fuel consumption. This inefficiency can be attributed to the knock sensor 2 circuit shorting to ground, causing incorrect engine adjustments.</li> <li><b>Engine Knocking or Pinging</b>: Without proper knock sensor function, the engine may experience knocking or pinging sounds. This is often due to the knock sensor 2 circuit being shorted to ground, preventing it from detecting and correcting engine knock.</li> </ul>

<ul><li>The knock sensor 2 may be faulty, leading to incorrect readings or no signal being sent to the ECU.</li><li>The wiring harness for knock sensor 2 could be open or shorted, causing a disruption in the signal transmission.</li><li>Poor electrical connections in the knock sensor 2 circuit can result in intermittent or no signal, triggering the error code.</li></ul>

<ul> <li><b>Initial Inspection</b>: Visually inspect the knock sensor wiring and connectors for any signs of damage, corrosion, or disconnection.</li> <li><b>Check for Other DTCs</b>: Use an OBD-II scanner to check for any additional DTCs that may be related to the knock sensor circuit.</li> <li><b>Measure Sensor Resistance</b>: Disconnect the knock sensor and measure its resistance using a multimeter. Compare the reading to the manufacturer's specifications.</li> <li><b>Inspect Wiring Harness</b>: Check the wiring harness for continuity and shorts to ground. Repair or replace any damaged wiring.</li> <li><b>Test Sensor Signal</b>: Reconnect the knock sensor and use an oscilloscope to monitor the sensor signal while the engine is running. Ensure the signal is within the expected range.</li> <li><b>Check ECM/PCM</b>: Inspect the Engine Control Module (ECM) or Powertrain Control Module (PCM) for any signs of damage or malfunction. Test the ECM/PCM connectors and pins for proper connection.</li> <li><b>Replace Knock Sensor</b>: If all tests indicate the knock sensor is faulty, replace it with a new one and clear the DTC code using the OBD-II scanner.</li> <li><b>Verify Repair</b>: Start the engine and monitor the OBD-II scanner to ensure the P1320 code does not reappear. Test drive the vehicle to confirm the issue is resolved.</li></ul>

<p>The DTC code P1320 indicates a 'Knock Sensor 2 Circuit Short To Ground' in Volkswagen vehicles. This issue is <b>moderate</b> in severity.</p><ul><li>Immediate actions: Inspect the knock sensor wiring for shorts or damage.</li><li>Potential risks: Prolonged driving with this issue can lead to engine knocking, reduced performance, and potential engine damage.</li></ul>