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how to fix P0455 code in BMW 3 Series E90/E91 (2005-2012) - BMW 3 Series
Home/Cars/BMW/3 Series/E90/E91 (2005-2012)/how to fix P0455 code in BMW 3 Series E90/E91 (2005-2012)

how to fix P0455 code in BMW 3 Series E90/E91 (2005-2012)

BMW 3 Series E90/E91 (2005-2012)

Error Codes
2-4 hours
Time
medium
Difficulty
medium
Severity
Error Code: P0455
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
521 words

Problem Statement

The P0455 code indicates a large leak in the evaporative emission control system (EVAP) for a BMW 3 Series E90/E91 (2005-2012). This may lead to increased emissions and potential

Error Code
P0455
Estimated Time
2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

  • •Disconnect the battery before working on electrical systems.
  • •Allow the engine to cool completely before performing any inspections.

Symptoms

  • •Check engine light illuminated
  • •Failed emissions test
  • •Fuel smell near the vehicle
  • •Decreased fuel efficiency
  • •Hissing sound from the fuel tank area

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5

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
  • •Pliers
  • •Smoke machine (for leak detection)
  • •Torque wrench

Parts Required

  • •OEM gas cap
  • •EVAP hoses (if damaged)
  • •Charcoal canister or purge valve (if leaking)

Additional Information

Error Code
P0455
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
4 items
Parts Required
3 items

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Solution
1. Preparation
  • Gather all necessary tools and parts.
  • Ensure the vehicle is parked on a level surface and the engine is cool.
  • Disconnect the negative battery terminal to prevent electrical shorts.
2. Inspect and Replace the Gas Cap
  • Remove the gas cap and inspect the rubber seal for cracks or wear.
  • If damaged, replace it with an OEM gas cap.
  • Reinstall the gas cap and ensure it clicks securely.
3. Check and Replace Damaged EVAP Hoses
  • Locate the EVAP hoses connected to the charcoal canister and purge valve.
  • Disconnect the hoses using pliers if necessary.
  • Inspect for cracks or blockages; replace any damaged hoses with new ones.
  • Reconnect the hoses, ensuring they are secure.
4. Smoke Test and Repair Leaks
  • Attach a smoke machine to the EVAP system through the service port.
  • Observe for smoke escaping from any areas, indicating leaks.
  • Repair or replace any components as needed (e.g., charcoal canister, purge valve).
5. Reset the Check Engine Light
  • Reconnect the battery terminal.
  • Use the OBD-II scanner to clear the P0455 code from the memory.
  • Start the vehicle and ensure the check engine light does not reappear.