how to fix P0300 misfire code on Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Spark Plugs

• Remove the engine cover (if applicable) using a socket set.
• Disconnect the ignition coils from the spark plugs.
• Remove the spark plugs using a spark plug socket and ratchet.
• Inspect the old spark plugs; replace with new ones if worn or fouled (OEM recommended gap: 0.043 inches).
• Install new spark plugs, ensuring they are torqued to the manufacturer’s specification (typically 13 lb-ft).

3. Test and Replace Ignition Coils

• Check each ignition coil for resistance using a multimeter (typically 0.5 to 1.5 ohms for primary).
• If any coils are out of spec, replace the faulty ignition coils with OEM parts.
• Reinstall the ignition coils onto the new spark plugs and reconnect the wiring harness.

4. Fuel System Inspection

• Use a fuel pressure gauge to check the fuel pressure at the fuel rail (should be around 40-50 PSI for the Camry).
• If fuel pressure is low, check the fuel pump and filter; replace as needed.
• Ensure that fuel injectors are clean and functioning properly. Consider using a fuel injector cleaner if clogged.

5. Vacuum Leak Check

• Inspect all vacuum hoses for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to check for leaks around the intake manifold and hoses.
• Replace any damaged vacuum hoses or reseal intake components as necessary.

6. Reassemble and Reset

• Reinstall any engine covers and components removed during the process.
• Reconnect the battery.
• Clear any stored error codes using the OBD-II scanner.