← View Generic P0398 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

P0398: P0398: Ignition System Misfire

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
⚠️

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 P0398 Mean on 2021 Honda PASSPORT?

A misfire detected in one or more cylinders, affecting combustion efficiency, which can cause decreased engine performance, rough idling, and decreased fuel efficiency.
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Symptoms

  • • Rough idling
  • • decreased engine performance
  • • decreased fuel efficiency
  • • engine misfire
  • • decreased power
  • • and decreased acceleration.
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Common Causes

  • • Faulty spark plug
  • • faulty spark plug wire
  • • faulty ignition coil
  • • faulty fuel injector
  • • faulty oxygen sensor
  • • or a vacuum leak.
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How to Fix P0398 on 2021 Honda PASSPORT

1. Check and replace the spark plug, spark plug wire, and ignition coil if faulty. 2. Check and clean the fuel injector and oxygen sensor. 3. Check for vacuum leaks and repair 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

spark plug Shop ↗ spark plug wire Shop ↗ ignition coil Shop ↗ fuel injector Shop ↗ oxygen sensor Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 2021 Honda PASSPORT

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Related Diagnostic Codes

Other codes that may appear with P0398

P0396 Sequential Code

P0396: Ignition System Misfire

Medium
P0397 Sequential Code

P0397: Ignition System Misfire

Medium
P0399 Sequential Code

P0399: Ignition System Misfire

Medium
P0400 Sequential Code

P0400: Emissions Control System Malfunction

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