my Toyota Camry Eighth Generation (2018-present) has a check engine light with code P0300, what's wr...

Solution

1. Preparation

• Gather tools and parts required for inspection and repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent any electrical shorts.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil covers if necessary.
• Use a spark plug socket to remove spark plugs.
• Inspect the condition of each plug; replace them if they show signs of wear or damage.
• Gap new spark plugs according to manufacturer specifications (typically around 0.043 inches for a 2018 Camry).
• Install new or cleaned spark plugs and torque to the specified value (typically around 13 lb-ft).

3. Inspect and Replace Ignition Coils

• Remove the ignition coils from the spark plugs.
• Check for cracks or signs of arcing.
• If necessary, replace faulty ignition coils with OEM parts.
• Reinstall ignition coils and ensure they are seated properly.

4. Fuel Injector Inspection

• Remove fuel injector connectors and inspect for damage.
• Use a fuel injector cleaning kit to clean if they are clogged.
• If any injectors are faulty, replace them with OEM parts.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to detect leaks while the engine is running.
• Repair or replace any damaged hoses.

6. Perform Compression Test

• Remove all spark plugs and insert a compression gauge into each cylinder.
• Crank the engine and record the compression readings; they should be within manufacturer specifications (typically 180-220 psi).
• If compression is low in any cylinder, further investigation is needed to check for valve or piston issues.