← View Generic P0404 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

P0404: Exhaust Gas Recirculation Circuit Range/Performance

on 2021 Honda PASSPORT

Fix Cost
$50 - $350
Parts & Labor
Difficulty
3/5
1-3 hours
DIY Possible?
✅ Yes
Save money
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 P0404 Mean on 2021 Honda PASSPORT?

The EGR valve position does not match what the engine control module expects based on operating conditions.
⚠️

Symptoms

  • • Rough idle
  • • poor performance
  • • failed emissions test
  • • check engine light
  • • hesitation during acceleration.
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Common Causes

  • • Faulty EGR valve position sensor
  • • carbon buildup on EGR valve
  • • wiring issues to EGR system
  • • mechanical problems with EGR valve.
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How to Fix P0404 on 2021 Honda PASSPORT

Replace EGR valve position sensor, clean EGR valve and passages, repair wiring, replace EGR valve if mechanically faulty.

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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 ↗ EVAP Canister Shop ↗ Purge Valve Shop ↗ Vacuum Lines Shop ↗

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Related Diagnostic Codes

Other codes that may appear with P0404

P0402 Sequential Code

Exhaust Gas Recirculation Flow Excessive Detected

Medium
P0403 Sequential Code

P0403: Emissions Control System Not Operating Within Normal Parameters

Medium
P0405 Sequential Code

P0405: Emissions Control System Not Operating Within Normal Parameters

Medium
P0406 Sequential Code

P0406: Emissions Control System Not Operating Within Normal Parameters

Medium

💡 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