what does it mean if my Toyota Corolla E210 (2019-2024) has a P0301 code

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Replace Spark Plug

1. Remove the engine cover if applicable.
2. Using a socket set, remove the spark plug from cylinder 1.
3. Inspect the old spark plug for signs of wear or damage (carbon buildup, cracks).
4. Install a new spark plug, ensuring it is gapped to the manufacturer's specifications.
5. Tighten the spark plug to the specified torque (typically around 13-16 lb-ft).

3. Inspect and Replace Ignition Coil

1. Disconnect the electrical connector from the ignition coil on cylinder 1.
2. Remove the ignition coil by unscrewing it from the cylinder head.
3. Inspect the coil for cracks or corrosion.
4. If faulty, install a new ignition coil and secure it properly.
5. Reconnect the electrical connector.

4. Clean Fuel Injector

1. Locate the fuel injector for cylinder 1 and disconnect the electrical connector.
2. Remove any retaining clips or bolts securing the injector.
3. Pull the injector out gently, being careful not to damage the O-ring.
4. Clean the injector using a fuel injector cleaner kit or replace it if necessary.
5. Reinstall the injector with a new O-ring and secure it in place.

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 several times to obtain a compression reading.
4. Compare the reading to manufacturer specifications (typically around 180-200 psi).
5. If the compression is low, further investigation into engine internals may be required.