how to fix P0301 code in my Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool and disconnect the negative battery terminal.
• Tools required: socket set, torque wrench, OBD-II scanner, multimeter, compression tester.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 1 by unscrewing the mounting bolt and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug. If it’s worn or fouled, replace it with a new spark plug (ensure correct gap).
• Install the new spark plug and torque it to the manufacturer's specification (typically around 13 lb-ft for most spark plugs).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test Ignition Coil

• If the misfire persists after spark plug replacement, test the ignition coil using a multimeter.
• Disconnect the ignition coil and measure the resistance across the primary and secondary terminals.
• Compare readings with specifications found in the repair manual; replace the ignition coil if out of range.

4. Inspect Fuel Injector

• If the ignition system is functioning correctly, check the fuel injector for cylinder 1.
• Disconnect the fuel injector connector and measure resistance using a multimeter.
• Perform a cleaning procedure if clogged; otherwise, replace the fuel injector if it shows no resistance or is out of specification.

5. Compression Test

• If issues remain, perform a compression test on cylinder 1.
• Remove the spark plug, insert the compression tester, and crank the engine.
• Compare the compression reading with the manufacturer’s specified range; replace or repair the engine components if compression is low.