P0499 - Understanding the Evaporative Emission Control System Code

Quick Answer

P0499 means: P0499 indicates an issue with the evaporative emission control system's purge flow.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with P0499? Address as soon as possible to prevent further issues with emissions and fuel economy.

Common Questions

What does P0499 mean and how does it affect my car?

The P0499 code indicates a malfunction in your vehicle's evaporative emission control system, which helps prevent fuel vapors from escaping into the atmosphere. If left unresolved, this can lead to increased emissions, reduced fuel efficiency, and potential engine performance issues, ultimately affecting your vehicle's reliability.

What are the most common causes of P0499 and how much does it cost to fix?

Common causes of the P0499 code include a faulty purge valve, clogged EVAP hoses, and malfunctioning fuel tank pressure sensors. Repair costs typically range from $100 to $350 depending on the specific issue, with purge valve replacement being the most frequent repair.

Can I drive my car with P0499 or should I stop immediately?

While you might be able to drive your vehicle with the P0499 code, it is recommended to address the issue as soon as possible. Continuing to drive may lead to reduced fuel efficiency and increased emissions, which could result in failing an emissions test.

How can I diagnose P0499 myself using GeekOBD APP?

Using the GeekOBD APP, you can perform a full OBD2 scan to retrieve the P0499 code and view freeze frame data. This will help you understand the conditions under which the code was triggered. You can also use the app to monitor live data from the EVAP system components.

What vehicles are most commonly affected by P0499?

The P0499 code is commonly found in vehicles from manufacturers like Ford, Honda, Chevrolet, and Toyota, particularly in models from 2000 to 2020. If your vehicle falls into this category, it's prudent to stay alert for symptoms associated with this code.

How can I prevent P0499 from happening again?

To prevent the P0499 code from recurring, regularly inspect your EVAP system for leaks or damage, replace aging hoses, and ensure proper maintenance of the fuel system. Keeping the fuel tank at least a quarter full can also help prevent pressure issues.

What is P0499?

The P0499 diagnostic trouble code (DTC) indicates a problem within your vehicle's evaporative emission control system (EVAP). Specifically, this code signifies that there is an issue with the evaporative emission system purge flow during the diagnostic test. This system is crucial for controlling fuel vapors that can escape from the fuel tank and enter the atmosphere. When the vehicle’s onboard diagnostic system detects that the purge flow is either too high or too low, it triggers the P0499 code. Typical vehicles affected include models from popular manufacturers like Ford, Honda, and Chevrolet from the years 2000 to 2020. A malfunctioning EVAP system can lead to increased emissions, reduced fuel efficiency, and potential engine performance issues. It’s important to address this code promptly as it can affect your vehicle's overall performance and may lead to further complications if ignored. If you notice the check engine light illuminated on your dashboard, it could very well be related to this code, and it’s advisable to have it diagnosed and repaired as soon as possible to avoid costly repairs later on.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0499 is present:

  • Check engine light stays on constantly, indicating a persistent issue that needs attention.
  • Engine hesitates during acceleration, leading to a feeling of power loss and increased driver frustration.
  • Fuel economy decreased by 10-15%, meaning you might be filling up more frequently than usual due to inefficiencies.
  • Unusual odor of fuel vapors – if you notice this smell, it may signify a leak in the EVAP system.
  • Rough idling can occur when the purge valve is stuck open, causing an air-fuel mixture imbalance.

Possible Causes

Most common causes of P0499 (ordered by frequency):

  1. A faulty purge valve is the most common cause, with a likelihood of around 50%. This valve can stick open or closed, causing improper flow.
  2. Clogged or damaged EVAP hoses are another common issue, often due to wear and tear or exposure to heat, leading to vacuum leaks.
  3. A malfunctioning fuel tank pressure sensor can also trigger the code, which may require replacement to restore normal function.
  4. Less common but serious causes include a damaged charcoal canister that absorbs fuel vapors, leading to a complete system failure.
  5. In rare cases, faulty engine control modules (ECM) may misinterpret data, generating the P0499 code without actual EVAP system faults.

P0499 Repair Costs

Cost Breakdown by Repair Type

Purge Valve Replacement

Replacement of the faulty purge valve, which is often the primary issue causing the P0499 code.

  • Total: $150 - $300
  • Success rate: 85%
EVAP Hose Replacement

Replacing damaged or clogged EVAP hoses to restore proper flow.

  • Total: $100 - $200
  • Success rate: 75%
Fuel Tank Pressure Sensor Replacement

Replacement of the sensor to ensure accurate pressure readings.

  • Total: $200 - $350
  • Success rate: 70%
Money-Saving Tips for P0499
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional P0499 Diagnosis Process

Follow these systematic steps to accurately diagnose P0499. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components like the purge valve (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components like the purge valve (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success (15-20 minutes)

Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Purge Valve Replacement on 2016 Honda Civic

Vehicle: 2016 Honda Civic, 45,000 miles

Problem: Customer reported a persistent check engine light and decreased fuel efficiency.

Diagnosis: After scanning with the GeekOBD APP, the P0499 code was retrieved. A visual inspection revealed a faulty purge valve.

Solution: Replaced the purge valve and cleared the trouble codes.

Cost: $220 (parts: $60, labor: $160)

Result: Post-repair, the check engine light remained off, and fuel efficiency improved by 15%.

Case Study 2: EVAP Hose Repair on 2018 Ford F-150

Vehicle: 2018 Ford F-150, 30,000 miles

Problem: Customer complained about a strong fuel smell and the check engine light.

Diagnosis: Using the GeekOBD APP, the P0499 code was confirmed, and a visual inspection showed a damaged EVAP hose.

Solution: Replaced the damaged EVAP hose and performed a system test.

Cost: $180 (parts: $40, labor: $140)

Result: The strong fuel smell dissipated, and the check engine light was resolved.

Diagnose P0499

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P0499
System: Powertrain (Engine, Transmission, Emissions)
Severity: MEDIUM
Category: Engine Codes