how to fix P0301 misfire code in Toyota Camry XV70 (2018-2024)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter
• Fuel pressure gauge

2. Replace Spark Plug

1. Locate the spark plug for cylinder 1 (refer to the service manual for exact location).
2. Remove the ignition coil by unscrewing the retaining bolts and gently pulling it out.
3. Unscrew the spark plug using a socket and ratchet.
4. Inspect the old spark plug for wear; replace with a new OEM or equivalent spark plug.
5. Torque the new spark plug to the manufacturer's specifications (usually around 13-16 lb-ft).

3. Test and Replace Ignition Coil

1. Use a multimeter to test the ignition coil’s primary and secondary resistance.
2. If faulty, replace the ignition coil with an OEM or compatible part.
3. Reinstall the ignition coil on cylinder 1 and secure it properly.

4. Inspect Fuel Injector

1. Use a fuel pressure gauge to check fuel pressure at the rail (should be within manufacturer's specifications).
2. If pressure is low, check the fuel filter and pump; replace as necessary.
3. If injector is suspected to be clogged, remove it and clean it using an ultrasonic cleaner or replace it if necessary.

5. Check for Vacuum Leaks

1. With the engine running, spray carburetor cleaner around the intake manifold and throttle body.
2. Listen for engine RPM changes indicating a vacuum leak.
3. If a leak is found, replace the affected gasket or seal.