AutoCodes – Generic – P1459

P1459 Code - EVAP Emission Purge Flow Switch Malfunction

Quick Answer

P1459 indicates EVAP Emission Purge Flow Switch Malfunction. Common causes include Faulty Evaporative Emission (EVAP) Emission Purge Flow Switch, EVAP Emission Purge Flow Switch harness is open or shorted, EVAP Emission Purge Flow Switch circuit poor electrical connection. 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 Evaporative Emission (EVAP) Emission Purge Flow Switch, EVAP Emission Purge Flow Switch harness is open or shorted, EVAP Emission Purge Flow Switch circuit poor electrical connection.
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.

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Code Popularity 13,109

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1459 Description

OBDII Code P1459 - EVAP Emission Purge Flow Switch Malfunction - AutoCodes.com — P1459 Code - EVAP Emission Purge Flow Switch Malfunction

What does this mean?

What are the Possible Causes of the DTC P1459?

Faulty Evaporative Emission (EVAP) Emission Purge Flow Switch
EVAP Emission Purge Flow Switch harness is open or shorted
EVAP Emission Purge Flow Switch circuit poor electrical connection

How to Fix the DTC P1459?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1459 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1459 code?

Need more information on how to fix the P1459 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1459 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1459 Acura — EVAP Emission Purge Flow Switch Malfunction
P1459 Audi — Exhaust Gas Temperature Sensor 2 Range/Performance
P1459 BMW — Heated Catalyst Heater Power Supply Open Circuit Bank 2
P1459 Honda — EVAP Emission Purge Flow Switch Malfunction
P1459 Isuzu — EVAP Emission Purge Flow Switch Malfunction
P1459 Volkswagen — Exhaust Gas Temperature Sensor 2 Range/Performance

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.