how to fix P0303 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: P0303

3 min read

554 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 P0303 cylinder 3 misfire in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0303

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on the ignition system.
•Allow the engine to cool before performing any work.

Symptoms

•Check engine light illuminated
•Rough idle
•Decreased fuel economy
•Engine stalling
•Loss of power during acceleration

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0303 and check for any additional codes.
2
Inspect spark plugs and ignition coils for signs of wear or damage.
3
Perform a visual inspection of the wiring and connectors associated with cylinder 3 ignition components.
4
Check for vacuum leaks around the intake manifold and throttle body.
5
Conduct a compression test on cylinder 3 to assess mechanical condition.
6
Test the fuel injector for cylinder 3 to ensure it is functioning properly.

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 (including 5/8" socket)
•Torque wrench
•Compression gauge
•Multimeter

Parts Required

•Spark plug (for cylinder 3)
•Ignition coil (for cylinder 3)
•Fuel injector (for cylinder 3)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0303 and check for any additional codes.
2
Inspect spark plugs and ignition coils for signs of wear or damage.
3
Perform a visual inspection of the wiring and connectors associated with cylinder 3 ignition components.
4
Check for vacuum leaks around the intake manifold and throttle body.
5
Conduct a compression test on cylinder 3 to assess mechanical condition.
6
Test the fuel injector for cylinder 3 to ensure it is functioning properly.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

Sub-steps:
1. Remove the engine cover if applicable.
2. Locate and remove the spark plug for cylinder 3 using a socket wrench (typically 5/8" socket).
3. Inspect the spark plug for signs of fouling or wear (replace if necessary).
4. Gap the new spark plug to manufacturer specifications (typically around 0.044 inches for Ford F-150).
5. Install the new spark plug and torque to 13 lb-ft.

3. Check and Replace Ignition Coil

Sub-steps:
1. Remove the ignition coil connector from cylinder 3.
2. Remove the ignition coil bolt and pull the coil out.
3. Inspect the coil for damage or corrosion.
4. Replace with a new ignition coil if faulty.
5. Reinstall the ignition coil and reconnect the electrical connector.

4. Fuel Injector Inspection

Sub-steps:
1. Disconnect the fuel injector connector for cylinder 3.
2. Remove the fuel rail if necessary to access the injector.
3. Check the injector for proper operation using a multimeter.
4. Replace the fuel injector if it is malfunctioning.
5. Reinstall the fuel rail and reconnect the fuel injector connector.

5. Conduct Compression Test

Sub-steps:
1. Remove the spark plug for cylinder 3 again.
2. Insert a compression gauge into the spark plug hole.
3. Crank the engine and record the compression reading.
4. Compare the reading to manufacturer specifications (typically around 120-150 psi).
5. If the compression is low, investigate possible causes (valve issues, head gasket failure).