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Home/Cars/Tesla/Model S/Plaid/Refresh (2021-present)/how to fix P0301 misfire code on Tesla Model S Original (2012-2020)

how to fix P0301 misfire code on Tesla Model S Original (2012-2020)

Tesla Model S Plaid/Refresh (2021-present)

Error Codes
Severity: highDifficulty: mediumError Code: P03012-4 hours
3 min read
520 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 P0301 cylinder 1 misfire in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0301
Affected Component
Engine
Estimated Time
2-4 hours

Safety Warnings

  • ⚠Disconnect battery before working on electrical systems.
  • ⚠Allow engine to cool before opening any components to avoid burns.

Symptoms

  • •Check engine light illuminated
  • •Rough idle or engine shaking
  • •Decreased acceleration or power
  • •Increased fuel consumption
  • •Potential overheating of the engine

Diagnostic Steps

  1. 1Retrieve error codes using an OBD-II scanner to confirm P0301 and check for any additional codes.
  2. 2Inspect the ignition coils and spark plugs for signs of wear or damage.
  3. 3Conduct a visual inspection of the wiring harness connected to cylinder 1 for frays or disconnections.
  4. 4Perform a compression test on cylinder 1 to rule out mechanical issues.
  5. 5Check fuel injector function for cylinder 1 using a test light or multimeter.
  6. 6Examine the mass airflow sensor (MAF) and throttle body for cleanliness and proper function.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the vehicle’s 12V battery to ensure safety while working on electrical components.

2. Inspect and Replace Ignition Components

  • Tools Required: Socket set, torque wrench, spark plug socket
  • Remove the engine cover if applicable.
  • Disconnect the ignition coil connector for cylinder 1.
  • Remove the ignition coil using the socket set.
  • Inspect the spark plug. If it appears worn or fouled, remove it using the spark plug socket.
  • Replace the spark plug with a new one that meets OEM specifications (typically gap .030 inches).
  • Install the new ignition coil, ensuring it is seated correctly and reconnect the connector.
  • Torque the ignition coil and spark plug to manufacturer specifications.

3. Inspect Fuel Injector

  • Tools Required: Fuel injector tester or multimeter
  • Disconnect the fuel injector connector for cylinder 1.
  • Test the fuel injector with a multimeter to ensure it is receiving the correct voltage.
  • If the fuel injector is faulty, remove it and replace it with a new one.
  • Reconnect the fuel injector connector.

4. Reassemble and Reconnect

  • Reinstall any components that were removed, such as the engine cover.
  • Reconnect the 12V battery.

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
  • •Spark plug socket
  • •Fuel injector tester or multimeter

Parts Required

  • •Ignition coil (for cylinder 1)
  • •Spark plug (for cylinder 1)
  • •Fuel injector (if found faulty)

Additional Information

Error Code
P0301
Affected Component
Engine
Estimated Time
2-4 hours
Difficulty
medium
Severity
high
Tools Required
5 items
Parts Required
3 items

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