how to troubleshoot a P0301 code in my Tesla Model S Original (2012-2020)

Learn how to troubleshoot and fix P0301 cylinder 1 misfire in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the ignition is turned off.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Locate the spark plug for cylinder 1.
  3. Unscrew the spark plug using a spark plug socket and ratchet.
  4. Inspect the spark plug for damage or excessive wear.
  5. Replace the spark plug with a new one, ensuring the correct gap is set (usually 0.028-0.032 inches for Tesla Model S).
  6. Torque the spark plug to the manufacturer's specified value (typically around 12-15 lb-ft).

3. Check and Replace Ignition Coil

• Sub-steps:
  1. Disconnect the ignition coil connector for cylinder 1.
  2. Remove the ignition coil by unscrewing it from the cylinder head.
  3. Inspect for cracks or damage to the ignition coil.
  4. Replace with a new ignition coil if damaged.
  5. Reinstall the ignition coil and reconnect the electrical connector.

4. Perform Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert a compression gauge into the spark plug hole.
  3. Crank the engine to take a compression reading.
  4. Compare the reading to the manufacturer’s specifications (typically 170-230 psi).
  5. If the compression is low, further investigation into the engine's internal components may be needed.

5. Inspect Fuel Injector

• Sub-steps:
  1. Locate the fuel injector for cylinder 1.
  2. Disconnect the fuel injector electrical connector.
  3. Perform a resistance test with a multimeter to ensure it is within specifications (usually around 12-16 ohms).
  4. If the injector is faulty, remove it and replace it with a new unit.
  5. Reconnect the injector and its electrical connector.