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

557 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 electrical components.
•Allow the engine to cool before opening the hood to prevent burns.

Symptoms

•Check engine light illuminated
•Rough idle or engine shaking
•Decreased engine power or acceleration
•Increased fuel consumption
•Possible engine stalling

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0303 and check for any additional codes.
2
Inspect the spark plug and ignition coil for cylinder 3 for signs of wear, damage, or carbon buildup.
3
Perform a compression test on cylinder 3 to check for any issues with engine compression.
4
Use a multimeter to test the ignition coil resistance and ensure it is within manufacturer specifications.
5
Check fuel injector operation for cylinder 3 by listening for clicking sounds while the engine is running or using a noid light.
6
Inspect fuel pressure with a fuel pressure gauge to ensure it meets specifications.

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
•Spark plug socket
•Ratchet and socket set
•Multimeter
•Fuel pressure gauge
•Noid light (optional)

Parts Required

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

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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 the spark plug and ignition coil for cylinder 3 for signs of wear, damage, or carbon buildup.
3
Perform a compression test on cylinder 3 to check for any issues with engine compression.
4
Use a multimeter to test the ignition coil resistance and ensure it is within manufacturer specifications.
5
Check fuel injector operation for cylinder 3 by listening for clicking sounds while the engine is running or using a noid light.
6
Inspect fuel pressure with a fuel pressure gauge to ensure it meets specifications.

Solution

1. Preparation

Gather tools and parts, ensuring the vehicle is parked on a level surface.
Disconnect the battery to prevent electrical shorts.
Allow the engine to cool completely before proceeding.

2. Replace Spark Plug

Sub-steps:
1. Remove the ignition coil from cylinder 3 by unscrewing the bolts and disconnecting the electrical connector.
2. Extract the spark plug using a spark plug socket and ratchet. Inspect the old spark plug for damage or excessive wear.
3. Install a new spark plug, ensuring it is gapped to the manufacturer’s specification.
4. Reinstall the ignition coil over the new spark plug and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

Sub-steps:
1. If the ignition coil tested out of specification, remove the coil as previously stated.
2. Install the new ignition coil and secure it with bolts.
3. Reconnect the electrical connector.

4. Inspect and Replace Fuel Injector (if necessary)

Sub-steps:
1. Disconnect the fuel rail and remove the fuel injector for cylinder 3.
2. Inspect the injector for clogs or damage. Test its resistance using a multimeter.
3. Install a new fuel injector if the old one is faulty, ensuring it is seated correctly in the fuel rail.

5. Reconnect Battery and Clear Codes

Sub-steps:
1. Reconnect the battery terminals securely.
2. Use the OBD-II scanner to clear the P0303 code and any other stored codes.

Tools Required:

OBD-II scanner
Spark plug socket
Ratchet and socket set
Multimeter
Fuel pressure gauge
Noid light (optional)

Parts Required:

Spark plug (for cylinder 3)
Ignition coil (if needed)
Fuel injector (if needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

Disconnect the battery before working on electrical components.
Allow the engine to cool before opening the hood to prevent burns.