← View Generic P0425 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2021 Honda PASSPORT
P0425: P0425: Catalytic Converter Efficiency Below Threshold
on 2021 Honda PASSPORT
Fix Cost
$200 - $1000
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
❌ No
Pro recommended
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 P0425 Mean on 2021 Honda PASSPORT?
The catalytic converter is not functioning within normal parameters, which can cause excessive emissions and decreased fuel efficiency.
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Symptoms
- • Rough idling
- • decreased fuel efficiency
- • increased emissions
- • check engine light on
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Common Causes
- • Clogged or dirty catalytic converter
- • faulty oxygen sensor
- • clogged or restricted exhaust system
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How to Fix P0425 on 2021 Honda PASSPORT
1. Inspect and clean or replace the catalytic converter, 2. Check and replace the oxygen sensor, 3. Inspect and clear any blockages in the exhaust system
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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 SpecsParts for 2021 Honda PASSPORT
Essential Tool
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Related Diagnostic Codes
Other codes that may appear with P0425
P0423
Sequential Code
P0423: Catalyst Efficiency Below Threshold
Medium
P0424
Sequential Code
P0424: Catalyst Efficiency Below Threshold
Medium
P0426
Sequential Code
P0426: Catalyst Efficiency Below Threshold
Medium
P0427
Sequential Code
P0427: Catalytic Converter Efficiency Below Threshold
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