how to fix P0302 misfire code on Ford F-150 13th Generation (2015-2020)

Ford F-150 13th Generation (2015-2020)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0302

3 min read

580 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0302 cylinder 2 misfire in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0302

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow engine to cool before removing components.

Symptoms

•Check engine light illuminated
•Rough idle
•Loss of power during acceleration
•Increased fuel consumption
•Engine vibrations or shaking
•Possible engine stalling

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0302 and check for additional codes.
2
Inspect the spark plug in cylinder 2 for wear or damage.
3
Check the ignition coil for proper functioning and signs of arcing.
4
Perform a compression test on cylinder 2 to rule out mechanical issues.
5
Inspect fuel injector operation in cylinder 2 with a noid light or fuel pressure gauge.
6
Check for vacuum leaks around the intake manifold that could affect cylinder performance.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Socket set
•Torque wrench
•Compression tester
•Noid light or fuel pressure gauge
•Multimeter

Parts Required

•Spark plug (for cylinder 2)
•Ignition coil (if faulty)
•Fuel injector (if faulty)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0302 and check for additional codes.
2
Inspect the spark plug in cylinder 2 for wear or damage.
3
Check the ignition coil for proper functioning and signs of arcing.
4
Perform a compression test on cylinder 2 to rule out mechanical issues.
5
Inspect fuel injector operation in cylinder 2 with a noid light or fuel pressure gauge.
6
Check for vacuum leaks around the intake manifold that could affect cylinder performance.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

OBD-II scanner
Socket set
Torque wrench
Compression tester
Noid light or fuel pressure gauge
Multimeter

2. Replace Spark Plug

Remove the engine cover (if applicable) using a socket set.
Disconnect the ignition coil connector for cylinder 2.
Remove the ignition coil bolt and lift the coil out.
Remove the spark plug using a spark plug socket.
Inspect and replace with a new spark plug (ensure correct gap).
Reinstall the ignition coil and reconnect the connector.
Replace the engine cover.

3. Test and Replace Ignition Coil

Use a multimeter to test the resistance of the ignition coil for cylinder 2, comparing it to the specifications in the service manual.
If the coil is faulty, remove it as described in step 2.
Install the new ignition coil and reconnect the electrical harness.

4. Inspect and Replace Fuel Injector

Use a noid light to check for proper signal to the fuel injector.
If no signal is found, trace wiring back to PCM or replace the injector if it’s faulty.
To replace the injector, remove the intake manifold if necessary.
Disconnect the injector clip and remove the old injector.
Install the new injector with new O-rings and reconnect the clip.

5. Perform Compression Test

Remove the spark plug from cylinder 2.
Install the compression tester into the spark plug hole.
Crank the engine for several revolutions and note the reading.
Compare with specifications; if low, further investigation into the engine internals is needed.