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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety during repairs.
• Tools required: OBD-II scanner, socket set, torque wrench, multimeter, and basic hand tools.

2. Inspect and Replace Spark Plugs

• Remove engine cover (if applicable).
• Disconnect ignition coils: Remove any wiring harness clips.
• Remove spark plugs using a spark plug socket.
• Inspect spark plugs for signs of wear, carbon buildup, or damage.
• Replace spark plugs if they are worn or fouled; use manufacturer-recommended plugs.
• Reinstall ignition coils and reconnect wiring harnesses.

3. Check and Replace Fuel Injectors

• Remove fuel rail: Disconnect fuel lines using appropriate tools and remove any bolts securing the rail.
• Inspect fuel injectors for clogs or leaks.
• Replace faulty injectors with OEM parts if necessary.
• Reinstall fuel rail and ensure all connections are secure.

4. Inspect Vacuum Lines

• Visually inspect all vacuum lines for cracks or disconnections.
• Replace any damaged vacuum lines with new ones.
• Reattach all components ensuring a tight fit.

5. Verify Engine Timing and Compression

• Perform a compression test on all cylinders to ensure they are within manufacturer specifications.
• Check timing marks to ensure that the timing belt/chain is aligned correctly.