← View Generic P0412 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

P0412: Secondary Air Injection System Switching Valve A Circuit Malfunction

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 P0412 Mean on 2021 Honda PASSPORT?

The switching valve that controls secondary air injection flow has an electrical malfunction.
⚠️

Symptoms

  • • Failed emissions test
  • • check engine light
  • • poor cold start emissions performance.
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Common Causes

  • • Faulty air injection switching valve
  • • wiring problems to valve
  • • poor electrical connections
  • • valve stuck open or closed.
🛠️

How to Fix P0412 on 2021 Honda PASSPORT

Replace air injection switching valve, repair wiring to valve, clean electrical connections, test valve operation.

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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 P0412

P0410 Sequential Code

P0410: Emissions Control System Not Operating Within Normal Parameters

Medium
P0411 Sequential Code

Secondary Air Injection System Incorrect Flow Detected

Medium
P0413 Sequential Code

Secondary Air Injection System Switching Valve A Circuit Open

Medium
P0414 Sequential Code

Secondary Air Injection System Switching Valve A Circuit Shorted

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