how to fix P0300 misfire code in Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, torque wrench, socket set, dielectric grease.
• Ensure the vehicle is parked on a flat surface and the parking brake is engaged.
• Disconnect the high-voltage battery according to manufacturer guidelines to ensure safety.

2. Inspect and Replace Ignition Components

1. Remove Engine Cover:

   • Use a socket set to remove the bolts securing the engine cover.
   • Carefully lift off the cover and set it aside.

2. Check Spark Plugs:

   • Remove the spark plug wires or ignition coils by gently twisting and pulling them out.
   • Inspect each spark plug for wear, carbon build-up, or damage.
   • If any spark plug appears worn or damaged, replace it with a new one, ensuring it meets manufacturer specifications (typically NGK or Bosch).

3. Inspect Ignition Coils:

   • Visually inspect the ignition coils for cracks or signs of wear.
   • If any coil is damaged, replace it with a new coil, ensuring it is seated properly in the spark plug hole.

4. Apply Dielectric Grease:

   • Apply a small amount of dielectric grease to the terminals of the ignition coils and spark plugs to prevent moisture ingress and ensure better connectivity.

3. Reassemble and Test

1. Reattach Components:

   • Reinstall the ignition coils and securely connect the spark plug wires.
   • Place the engine cover back on and tighten the bolts to manufacturer specifications.

2. Reconnect Battery:

   • Reconnect the high-voltage battery, ensuring all connections are secure.

3. Clear Codes:

   • Use the OBD-II scanner to clear the P0300 code and any other related codes.