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

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

Subaru Outback 5th Generation (2015-2019)

Severity: highDifficulty: mediumError Code: P03032-4 hours
3 min read
599 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 5th Generation. 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 opening any components.

Symptoms

  • •Check engine light illuminated
  • •Rough idle or engine shaking
  • •Decreased acceleration or power loss
  • •Poor fuel economy
  • •Engine stalling or hesitation during acceleration

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm the P0303 code.
  2. 2Inspect the spark plug in cylinder 3 for wear or damage.
  3. 3Check the ignition coil for proper operation and signs of failure.
  4. 4Test the fuel injector for cylinder 3 for clogs or malfunction.
  5. 5Perform a compression test on cylinder 3 to check for mechanical issues.
  6. 6Inspect for vacuum leaks around the intake manifold and associated hoses.

Solution

Solution

1. Preparation

  • Gather tools and parts required for the repair.
  • Disconnect the negative battery terminal to prevent electrical shorts.
  • Allow the engine to cool down before working on ignition components.

2. Inspect and Replace Spark Plug

  • Tools Required: Socket set, torque wrench.
  • Remove the ignition coil cover (if applicable).
  • Use a socket to carefully remove the spark plug from cylinder 3.
    • Inspect the spark plug for fouling, wear, or damage.
    • Replace with a new spark plug if necessary (ensure correct gap).
  • Torque the new spark plug to manufacturer specifications (usually around 13-15 lb-ft).

3. Check and Replace Ignition Coil

  • Disconnect the electrical connector from the ignition coil.
  • Remove the ignition coil from cylinder 3.
  • Inspect for cracks or signs of wear.
  • Replace with a new ignition coil if faulty.
  • Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

  • Disconnect the fuel injector electrical connector and fuel line (use caution with fuel).
  • Remove the fuel injector from cylinder 3.
  • Inspect and clean the injector using a fuel injector cleaner or replace if clogged.
  • Reinstall the fuel injector and reconnect the fuel line and electrical connector.

5. Perform Compression Test

  • Remove the spark plug from cylinder 3.
  • Insert a compression gauge into the spark plug hole.
  • Crank the engine and record the compression reading.
  • Compare the reading to manufacturer specifications; replace the cylinder head gasket or repair if compression is low.

6. Check for Vacuum Leaks

  • Inspect all hoses around the intake manifold for cracks or disconnections.
  • Use a smoke test or carburetor cleaner to check for leaks while the engine is running.
  • Repair any vacuum leaks found.

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 gauge
  • Fuel injector cleaner

Parts Required

  • Spark plug (for cylinder 3)
  • Ignition coil (for cylinder 3)
  • Fuel injector (if cleaning/replacement is necessary)

Additional Information

Error CodeP0303
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

5 items

Parts

3 items

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