← View Generic P0431 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

P0431: P0431: Exhaust Gas Recirculation (EGR) System Malfunction

on 2021 Honda PASSPORT

Fix Cost

$100 - $500

Parts & Labor

Difficulty

3/5

1-2 hours

DIY Possible?

✅ Yes

Save money

Your Vehicle

2021 Honda

PASSPORT

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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 P0431 Mean on 2021 Honda PASSPORT?

The EGR system is not operating within normal parameters, which can cause increased emissions and decreased engine performance.

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Symptoms

• Rough idle
• decreased fuel efficiency
• increased emissions
• and a check engine light

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Common Causes

• Faulty EGR valve
• clogged EGR passages
• EGR sensor malfunction
• or a vacuum leak

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How to Fix P0431 on 2021 Honda PASSPORT

1. Check and clean the EGR passages and valve. 2. Replace the EGR valve if necessary. 3. Check and repair any vacuum leaks. 4. Test the EGR sensor and replace if necessary.

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Need Maintenance Info for Your PASSPORT?

Get oil capacity, filter specs, and torque settings for your specific 2021 Honda PASSPORT.

View 2021 Honda PASSPORT Specs

Parts for 2021 Honda PASSPORT

EGR valve Shop ↗ EGR passages cleaning kit Shop ↗ vacuum leak repair kit Shop ↗

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OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with P0431

P0429 Sequential Code

💡 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