Toyota Corolla E170 (2013-2019) P0300 code what does it mean

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the battery for safety.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil covers if applicable.
• Use a spark plug socket to remove the spark plugs.
• Inspect the spark plugs for fouling or excessive wear.
• Replace with OEM or equivalent spark plugs, torquing to the manufacturer's specifications (typically around 13 lb-ft).
• Reinstall the ignition coils securely.

3. Check and Replace Ignition Coils

• Remove the ignition coils by unscrewing the retaining bolts.
• Inspect the connectors and wiring for damage.
• Replace any faulty ignition coils with new OEM parts.
• Reinstall the ignition coils, ensuring they are seated correctly.

4. Inspect Fuel Injectors

• Disconnect the fuel injector connectors.
• Use a fuel injector cleaning kit to clean each injector if they are clogged.
• Replace any faulty injectors with new ones if cleaning does not resolve the issue.

5. Check for Vacuum Leaks

• Inspect all vacuum lines for cracks or disconnections.
• Replace any damaged vacuum lines.
• Use a smoke test if needed to locate hard-to-find vacuum leaks.

6. Perform Compression Test

• Remove spark plugs for access.
• Use a compression tester to check the compression in each cylinder.
• Compare results to the manufacturer's specifications (typically 170-220 psi).
• Address any cylinders with low compression by inspecting for valve issues or head gasket failure.