how to diagnose a misfire code P0302 on Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, compression tester, multimeter, noid light, and basic hand tools.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Replace Spark Plug and Ignition Coil

• Remove the engine cover (if applicable) using a socket set.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil by unscrewing the bolts and gently pulling it out.
• Replace the spark plug for cylinder 2 by using a spark plug socket, ensuring the gap is set to manufacturer's specifications (typically around 0.044 inches for Honda).
• Install the new ignition coil and secure it with bolts, reconnecting the electrical connector.

3. Check and Replace Fuel Injector (if necessary)

• Disconnect the fuel injector connector for cylinder 2.
• Use a multimeter or noid light to check for proper electrical signal to the injector.
• If the injector is faulty, remove it by unscrewing any retaining clips and gently pulling it out of the fuel rail.
• Install the new fuel injector, ensuring to lubricate the O-rings with engine oil before installation.
• Reconnect the fuel injector connector.

4. Compression Test (if necessary)

• Remove the spark plug from cylinder 2 again.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading; it should be within the manufacturer's specified range (typically 180-200 psi).
• If compression is low, further investigate potential internal engine damage.