← View Generic P0459 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

P0459: P0459: Evaporative Emission Control System Incorrect Purge Flow

on 2021 Honda PASSPORT

Fix Cost
$100 - $500
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
❌ No
Pro recommended
Your Vehicle
2021 Honda
PASSPORT
⚠️

Important for 2021 Honda PASSPORT Owners

Before starting repairs, verify which engine your 2021 Honda PASSPORT has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does P0459 Mean on 2021 Honda PASSPORT?

The Evaporative Emission Control System (EVAP) is not functioning correctly, which can cause the vehicle to emit excessive amounts of hydrocarbons into the atmosphere.
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Symptoms

  • • Rough idling
  • • decreased fuel efficiency
  • • sweet or gasoline-like odor
  • • check engine light illuminated
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Common Causes

  • • Faulty EVAP canister purge valve
  • • clogged EVAP canister vent hose
  • • faulty EVAP canister purge valve solenoid
  • • faulty fuel tank pressure sensor
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How to Fix P0459 on 2021 Honda PASSPORT

1. Check and clean the EVAP canister vent hose. 2. Replace the EVAP canister purge valve solenoid. 3. Replace the EVAP canister purge valve. 4. Check and replace the fuel tank pressure sensor.

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Need Maintenance Info for Your PASSPORT?

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Parts for 2021 Honda PASSPORT

EVAP canister purge valve solenoid Shop ↗ EVAP canister purge valve Shop ↗ fuel tank pressure sensor Shop ↗

Essential Tool

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OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with P0459

P0457 Sequential Code

P0457: Evaporative Emission Control System Incorrect Purge Flow

Medium
P0458 Sequential Code

P0458: Evaporative Emission Control System Incorrect Purge Flow

Medium
P0460 Sequential Code

P0460: Emissions Control System Not Operating Within Normal Parameters

Medium
P0461 Sequential Code

Fuel Level Sensor Circuit Range/Performance Problem

Low

💡 Why These Codes Are Related:

  • • Similar Issues: Same root cause or component failure
  • • Related Problems: Often occur together due to system interactions
  • • Sequential Codes: Progressive failure stages or multiple sensors
  • • Same System: Components within the same automotive system