← View Generic P0139 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2021 Honda PASSPORT
P0139: Oxygen Sensor Circuit Slow Response Bank 1 Sensor 2
on 2021 Honda PASSPORT
Fix Cost
$50 - $250
Parts & Labor
Difficulty
2/5
30 mins - 1 hour
DIY Possible?
✅ Yes
Save money
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 P0139 Mean on 2021 Honda PASSPORT?
The downstream oxygen sensor on bank 1 is responding too slowly to exhaust changes.
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Symptoms
- • Failed emissions test
- • check engine light
- • poor catalytic converter monitoring.
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Common Causes
- • Aging oxygen sensor
- • contaminated sensor
- • exhaust leaks
- • poor sensor connections.
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How to Fix P0139 on 2021 Honda PASSPORT
Replace oxygen sensor, repair exhaust leaks, clean sensor connections, check sensor ground.
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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 P0139
P0137
Sequential Code
Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2
Medium
P0138
Sequential Code
Oxygen Sensor Circuit High Voltage Bank 1 Sensor 2
Medium
P0140
Sequential Code
Oxygen Sensor Circuit No Activity Bank 1 Sensor 2
Medium
P0141
Sequential Code
Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 2
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