how to fix P0302 code on my Ram 1500 DT (2019-Present) for cylinder 2 misfire?

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface with the engine off and cooled down.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

1. Remove the ignition coil from cylinder 2:
   • Unplug the electrical connector.
   • Remove the mounting bolts using a socket set.
2. Extract the spark plug from cylinder 2:
   • Use a spark plug socket and ratchet to unscrew and remove the spark plug.
3. Inspect the spark plug:
   • Check for signs of fouling, wear, or damage.
   • If necessary, replace with a new spark plug according to manufacturer specifications (typically NGK or Mopar brand).
4. Reinstall the spark plug and ignition coil, ensuring proper torque (usually about 13 lb-ft for spark plugs).

3. Inspect and Test Ignition Coil

1. Remove the ignition coil from cylinder 2 as previously described.
2. Test the ignition coil resistance using a multimeter:
   • Measure primary and secondary resistance (primary should be around 0.5-1.5 ohms, secondary should be around 6,000-15,000 ohms).
   • If outside the range, replace the ignition coil.
3. Reinstall or replace ignition coil as necessary.

4. Check Fuel Injector

1. Inspect the fuel injector for cylinder 2:
   • Remove the fuel rail if necessary to access the injector.
   • Check for clogs or leaks.
2. Test the fuel injector using a noid light:
   • Connect the noid light to the injector connector to see if it pulses while cranking.
   • Replace the injector if it does not pulse or shows signs of malfunction.

5. Check for Vacuum Leaks

1. Visually inspect vacuum hoses and intake manifold near cylinder 2 for cracks or loose connections.
2. Use smoke testing or carburetor cleaner around suspected areas while the engine is running to identify leaks.