my Tesla Model S Original (2012-2020) has a check engine light and code P0300

Learn how to diagnose and fix P0300 random/multiple cylinder misfire in Tesla Model S. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative terminal of the battery.

2. Inspect Ignition System

• Remove engine cover if applicable.
• Tools Required: Socket set, torque wrench.
• Remove spark plugs using a spark plug socket.
• Inspect plugs for fouling, wear, or deposits.
• Replace any damaged plugs with OEM specifications.
• Reinstall plugs with proper torque (typically 15-20 lb-ft).

3. Check and Replace Ignition Coils

• Disconnect the electrical connectors from the ignition coils.
• Remove the coils from the spark plug wells.
• Tools Required: Socket set.
• Inspect coils for cracks or carbon tracking.
• Replace any faulty ignition coils with OEM components.
• Reinstall coils and reconnect electrical connectors.

4. Fuel Injector Inspection

• Access fuel injectors by removing the intake manifold if necessary.
• Inspect injectors for proper installation and any signs of leakage.
• Use a fuel pressure gauge to check fuel pressure at the rail.
• If injectors are clogged or faulty, clean or replace them.

5. Vacuum Leak Check

• Visually inspect all vacuum lines for cracks or disconnects.
• Use a smoke machine or carburetor cleaner to detect leaks.
• Repair or replace any damaged vacuum lines.

6. Verify Engine Compression

• Remove spark plugs and disable fuel injectors.
• Use a compression tester to check each cylinder.
• Record the compression readings and compare to manufacturer specifications.
• Rebuild or replace components if any cylinders show low compression.