← View Generic P0424 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

P0424: P0424: Catalyst Efficiency Below Threshold

on 2021 Honda PASSPORT

Fix Cost

$200 - $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 P0424 Mean on 2021 Honda PASSPORT?

The onboard computer has detected that the catalytic converter is not functioning within normal parameters, which can lead to increased emissions and decreased fuel efficiency.

⚠️

Symptoms

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

🔍

Common Causes

• Clogged or dirty catalytic converter
• faulty oxygen sensor
• or a vacuum leak.

🛠️

How to Fix P0424 on 2021 Honda PASSPORT

1. Inspect and clean the catalytic converter. 2. Replace the oxygen sensor if faulty. 3. Repair or replace the vacuum leak.

🔧

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

catalytic converter Shop ↗ oxygen sensor Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 2021 Honda PASSPORT

Shop Scanners ↗

🔗

Related Diagnostic Codes

Other codes that may appear with P0424

P0422 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