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Engine-Codes – Generic – P1459

P1459 Code - EVAP Emission Purge Flow Switch Malfunction

Quick Answer

The P1459 diagnostic trouble code (DTC) specifically refers to a malfunction in the EVAP (Evaporative Emission) emission purge flow switch. Common causes include Faulty purge flow switch, Wiring or electrical issues, Vacuum leaks in the EVAP system. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1459 indicates EVAP Emission Purge Flow Switch Malfunction.
Common causes
Common causes include Faulty purge flow switch, Wiring or electrical issues, Vacuum leaks in the EVAP system.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1459 Description

The P1459 diagnostic trouble code (DTC) specifically refers to a malfunction in the EVAP (Evaporative Emission) emission purge flow switch. The EVAP system is designed to capture and store fuel vapors from the fuel tank to prevent them from being released into the atmosphere. The purge flow switch is responsible for controlling the flow of fuel vapors from the charcoal canister to the engine for combustion.

OBDII Code P1459 - EVAP Emission Purge Flow Switch Malfunction
P1459 Code - EVAP Emission Purge Flow Switch Malfunction

Common Causes of P1459

  1. Faulty purge flow switch
  2. Wiring or electrical issues
  3. Vacuum leaks in the EVAP system
  4. Charcoal canister saturation
  5. EVAP system leaks

Symptoms of P1459

  1. Check Engine Light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Rough idling or stalling
  4. Strong fuel odor
  5. Failed emissions test

How to Fix P1459

  1. Diagnose the issue using a scan tool to verify the P1459 code and identify the specific problem with the EVAP system.
  2. Inspect the purge flow switch and associated wiring for any signs of damage or corrosion.
  3. Test the purge flow switch for proper functionality and replace if necessary.
  4. Check for vacuum leaks in the EVAP system and repair as needed.
  5. Clear the DTC and reset the Check Engine Light to verify that the issue has been resolved.

Cost to Fix P1459

The cost of repairing a P1459 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair cost for this issue can range from $100 to $300, including parts and labor. It's important to note that additional diagnostic time or parts replacement may increase the total cost. It's recommended to consult with a professional mechanic for a more accurate estimate based on the specific circumstances of your vehicle.

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Code P1459 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1459 Code

1. What does the OBDII code P1459 mean?

P1459 indicates a malfunction with the EVAP emission purge flow switch, which monitors the flow of fuel vapors from the EVAP system to the engine.

2. What are the symptoms of code P1459?

Common symptoms include the check engine light turning on, increased fuel odor, reduced fuel efficiency, and potential difficulty starting the engine.

3. What causes the P1459 code to appear?

Possible causes include a faulty purge flow switch, damaged or disconnected EVAP hoses, a malfunctioning purge solenoid valve, or electrical issues like corroded wiring or bad connectors.

4. Can I drive my car with a P1459 code?

While the car may still be drivable, ignoring this code can lead to increased emissions and potential engine performance issues. It's best to address it promptly.

5. How is the P1459 code diagnosed?

A technician will inspect the EVAP system, test the purge flow switch and solenoid, check for vacuum leaks, and use a scan tool to monitor live data and confirm the fault.

6. How do you fix the P1459 code?

Repairs may include replacing the purge flow switch, repairing damaged wiring, fixing vacuum leaks, or replacing the purge solenoid valve if needed.

7. Can a loose gas cap cause the P1459 code?

A loose or damaged gas cap is unlikely to cause this specific code but can trigger other EVAP-related codes. It's still worth checking as part of the diagnosis.

8. How much does it cost to fix a P1459 code?

Costs vary depending on the issue but typically range from $50 to $250 for parts and labor, with higher costs if major components need replacement.

9. Will clearing the code fix the P1459 issue?

Clearing the code may temporarily turn off the check engine light, but the underlying issue must be repaired to prevent the code from returning.

10. What tools are needed to troubleshoot the P1459 code?

Common tools include an OBDII scanner, a multimeter for electrical testing, a vacuum gauge, and sometimes a smoke machine to detect leaks in the EVAP system.

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