how to fix a P0301 code on my Toyota Corolla E210 (2019-2024)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel pressure gauge.
• Ensure the vehicle is parked on a level surface, and the engine is off and cool.

2. Inspect and Replace Spark Plug

1. Locate the spark plug for cylinder 1 (refer to the owner's manual for location).
2. Disconnect the ignition coil connector and remove the coil.
3. Remove the spark plug using a spark plug socket.
4. Inspect the spark plug for wear (look for signs of carbon buildup or damage).
5. If damaged, replace with a new spark plug (ensure proper gap as per manufacturer specifications).
6. Reinstall the spark plug and ignition coil, ensuring connections are secure.

3. Test and Replace Ignition Coil (if necessary)

1. Disconnect the ignition coil connector and remove the coil from cylinder 1.
2. Use a multimeter to measure the resistance of the ignition coil (check specifications in service manual).
3. If the coil is out of specification, replace it with a new one.
4. Reinstall the ignition coil and reconnect the connector.

4. Inspect and Clean Fuel Injector

1. Remove the fuel injector from cylinder 1 (consult service manual for exact procedure).
2. Check for clogs or deposits; if clogged, clean or replace the injector.
3. Reinstall the fuel injector ensuring proper seating and connection.

5. Compression Test

1. Remove the spark plug from cylinder 1.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine for a few seconds and read the compression value.
4. If compression is below specifications, further investigation into internal engine issues may be required.