how to fix P0300 code in Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0300 engine misfire in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and equipment: OBD-II scanner, multimeter, socket set, torque wrench, and inspection mirror.
• Ensure the vehicle is parked on a flat surface and the parking brake is engaged.
• Disconnect the high-voltage battery (if applicable) following manufacturer guidelines.

2. Inspect and Repair Ignition System

• Sub-step 1: Remove the engine cover (if applicable) using a socket set.
• Sub-step 2: Check each ignition coil for visible damage or corrosion. Replace any faulty coils with OEM parts.
• Sub-step 3: Inspect spark plugs; replace if they are worn or fouled. Use OEM specifications for the correct type and gap.
• Tools Required: Socket set, torque wrench.
• Safety Warnings: Handle high-voltage components with care; ensure proper grounding.

3. Check Fuel System

• Sub-step 1: Use a multimeter to test the fuel injectors for electrical continuity and proper resistance.
• Sub-step 2: If any injectors are found to be faulty, replace them with OEM injectors.
• Sub-step 3: Clean the fuel system with a suitable fuel system cleaner to remove any deposits.
• Tools Required: Multimeter, fuel injector cleaner.
• Safety Warnings: Work in a well-ventilated area when handling fuel.

4. Inspect for Vacuum Leaks

• Sub-step 1: Inspect all vacuum hoses leading to the intake manifold for cracks or disconnections.
• Sub-step 2: Use an intake air leak detection method (such as smoke testing) to identify any leaks.
• Sub-step 3: Replace or repair any damaged hoses or gaskets found during inspection.
• Tools Required: Smoke machine (if available).
• Safety Warnings: Ensure the engine is cool before working on intake components.