how to fix the check engine light with code P0302 on my Ram 1500 DT (2019-Present)?

Solution

1. Preparation

• Gather tools and materials.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool completely.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the engine cover if applicable.
• Use the spark plug socket to remove the spark plug from cylinder 2.
• Inspect the spark plug for fouling or excessive wear. Replace if necessary.
• Apply dielectric grease to the spark plug threads and reinstall, tightening to the manufacturer’s specified torque (typically around 13-15 ft-lbs).

3. Check and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil using a socket set.
• Inspect the coil for cracks or damage; replace if necessary.
• Reinstall the ignition coil and tighten to manufacturer specifications.

4. Inspect Fuel Injector

• Tools Required: Fuel injector puller (if necessary), socket set.
• Disconnect the fuel injector connector.
• Remove the fuel injector from cylinder 2.
• Inspect the injector for clogs or damage; clean or replace as needed.
• Reinstall the fuel injector and ensure it is seated properly.

5. Verify Compression

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2 and install the compression tester.
• Crank the engine and record the compression reading. Compare it to manufacturer specifications (typically around 120-160 psi).
• If compression is low, further investigation is needed on the engine internals.