how to diagnose a P0301 code on Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1 by unscrewing the mounting bolts and disconnecting the electrical connector.
• Carefully pull out the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for wear and replace it if necessary with the specified OEM part.
• Reinstall the spark plug and ignition coil, ensuring proper torque (typically 13 lb-ft).

3. Check and Replace Ignition Coil

• If the ignition coil was found faulty, remove it from cylinder 1 by unscrewing and disconnecting.
• Install a new ignition coil (OEM recommended) and reconnect the electrical connector.
• Torque the mounting bolts to the manufacturer’s specifications.

4. Inspect and Clean Fuel Injector

• If the fuel injector is clogged, remove it from the fuel rail.
• Clean the injector using an appropriate fuel injector cleaner or replace it with a new one.
• Reinstall the fuel injector securely into the rail.

5. Compression Test

• If compression was low in cylinder 1, further diagnosis is needed to check for potential head gasket issues or valve problems.
• If necessary, proceed with disassembly to inspect internal engine components.