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

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, compression gauge, multimeter, fuel injector cleaner.
• Ensure the vehicle is parked on a level surface with the engine off and cool.
• Disconnect the negative battery terminal.

2. Inspect and Replace Spark Plug

• Remove Engine Cover: Use a socket set to take off any necessary engine cover.
• Remove Spark Plug: Use a spark plug socket to carefully remove the spark plug from cylinder 1.
  • Check for wear: Look for signs of fouling or damage.
• Install New Spark Plug:
  • Torque new spark plug to manufacturer specifications (usually around 13-15 ft-lbs).
• Reconnect Components: Reattach any engine cover or components removed.

3. Check and Replace Ignition Coil

• Remove Ignition Coil: Unscrew the ignition coil from cylinder 1 using a socket set.
• Test Ignition Coil: Use a multimeter to check for proper resistance (typically around 0.5-0.7 ohms for primary).
• Install New Ignition Coil: If faulty, replace it with a new coil and torque it as specified (around 7-9 ft-lbs).

4. Fuel Injector Cleaning or Replacement

• Remove Fuel Injector: Disconnect fuel line and electrical connector, then unscrew the injector.
• Inspect Injector: Check for clogs or damage.
• Clean or Replace Injector: If clogged, clean with a fuel injector cleaner, or replace if necessary.
• Reinstall Injector: Ensure it is seated properly and reconnect.

5. Perform Compression Test

• Attach Compression Gauge: Remove spark plug and screw in the compression gauge.
• Crank Engine: Use the starter to crank the engine for a few seconds.
• Read Compression: Check if compression is within manufacturer specifications (usually around 180-200 psi).
• Address Low Compression: If low, further diagnostics may be needed (e.g., valves, head gasket).