how to fix P0301 code in Toyota Camry Eighth Generation (2018-present)?

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, socket set, multimeter, compression tester, fuel injector cleaner, and replacement parts as necessary.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1 by unscrewing the bolts and gently pulling it out.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for signs of wear, oil deposits, or carbon buildup.
• If necessary, replace the spark plug with a new one, ensuring the gap is set to manufacturer specifications.
• Reinstall the ignition coil over the new spark plug and secure with bolts.

3. Test and Replace Ignition Coil (if necessary)

• Use a multimeter to test the resistance of the ignition coil; compare with specifications found in the service manual.
• If the coil is faulty, replace it with a new unit. Ensure proper alignment and secure it.

4. Inspect and Clean Fuel Injector

• Disconnect the fuel injector connector and remove the retaining clips.
• Pull out the fuel injector and inspect it for clogs or damage.
• Clean the injector using a fuel injector cleaner or replace it if cleaning does not improve condition.
• Reinstall the cleaned or new fuel injector and reconnect the electrical connector.

5. Compression Test

• Insert the compression tester into the spark plug hole of cylinder 1.
• Crank the engine to take the reading. Compare the result with the manufacturer's specification.
• If compression is low, further investigation is required for possible internal engine issues (e.g., valve problems, head gasket failure).