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Home/Cars/Subaru/Outback/5th Generation (2015-2019)/how to address P0303 misfire code in my Tesla Outback 5th Generation (2015-2019)

how to address P0303 misfire code in my Tesla Outback 5th Generation (2015-2019)

Subaru Outback 5th Generation (2015-2019)

Severity: highDifficulty: mediumError Code: P03032-4 hours
3 min read
586 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 Tesla Outback (2015-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0303
Component
Engine
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before performing any inspection or repair.

Symptoms

  • •Check engine light illuminated
  • •Rough idle
  • •Decreased fuel efficiency
  • •Engine stalling during acceleration
  • •Increased exhaust emissions
  • •Unusual engine noises (e.g., popping or backfiring)

Diagnostic Steps

  1. 1Scan the vehicle's onboard diagnostic system using an OBD-II scanner to confirm the P0303 code.
  2. 2Inspect the ignition coil for cylinder 3 for any visible damage or wear.
  3. 3Check the spark plug in cylinder 3 for fouling, wear, or incorrect gap.
  4. 4Conduct a compression test on cylinder 3 to determine if there are any internal engine issues.
  5. 5Inspect the fuel injector for cylinder 3 for clogs or electrical faults.
  6. 6Examine the wiring and connectors associated with the ignition system and fuel injector for corrosion or disconnection.

Solution

Solution

1. Preparation

  • Gather all necessary tools and parts.
  • Disconnect the battery to prevent electrical issues during the repair.

2. Replace Spark Plug

  • Tools Required: Socket set, torque wrench, spark plug socket
  • Remove the ignition coil from cylinder 3 by unbolting it.
  • Unscrew the spark plug using a spark plug socket.
  • Inspect the old spark plug and replace it if necessary. Ensure the new spark plug is gapped correctly according to manufacturer specifications.
  • Install the new spark plug and torque it to the manufacturer's specified value (usually around 13-16 lb-ft).
  • Reattach the ignition coil.

3. Inspect and Replace Ignition Coil

  • Tools Required: Socket set, multimeter
  • If the spark plug replacement does not resolve the issue, test the ignition coil using a multimeter for proper resistance.
  • If defective, remove the ignition coil and replace it with a new one.
  • Reattach all connections securely.

4. Check Fuel Injector

  • Tools Required: Fuel injector cleaner, multimeter
  • If the ignition components are functioning correctly, check the fuel injector for cylinder 3.
  • Remove the injector and clean it with a fuel injector cleaner.
  • Test the injector with a multimeter to ensure it’s receiving the correct voltage and is functioning properly. Replace if necessary.

5. Perform Compression Test

  • Tools Required: Compression gauge
  • If all previous steps fail to resolve the misfire, perform a compression test on cylinder 3.
  • If the compression is low, further investigation into internal engine components (like valves or piston rings) may be necessary.

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
  • Multimeter
  • Compression gauge
  • Fuel injector cleaner

Parts Required

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

Additional Information

Error CodeP0303
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

7 items

Parts

3 items

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