← View Generic P0109 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2021 Honda PASSPORT
P0109: P0109: Mass Airflow Sensor (MAF) Circuit Low Input
on 2021 Honda PASSPORT
Fix Cost
$50 - $200
Parts & Labor
Difficulty
3/5
1-2 hours
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 P0109 Mean on 2021 Honda PASSPORT?
The mass airflow sensor (MAF) is not providing a valid signal to the engine control module (ECM), indicating a low airflow reading.
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Symptoms
- • Poor engine performance
- • rough idle
- • decreased power
- • and decreased fuel efficiency
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Common Causes
- • Faulty MAF sensor
- • dirty or clogged air filter
- • vacuum leaks
- • or wiring issues
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How to Fix P0109 on 2021 Honda PASSPORT
Replace the MAF sensor, clean or replace the air filter, inspect and repair vacuum leaks, and check wiring connections
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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 P0109
P0107
Sequential Code
P0107: Mass Airflow Sensor (MAF) Circuit Low Input
Medium
P0108
Sequential Code
P0108: Fuel Pressure Regulator Circuit Malfunction
Medium
P0110
Sequential Code
P0110: Fuel Temperature Sensor Circuit Malfunction
Medium
P0111
Sequential Code
P0111: Intake Air Temperature Sensor Circuit Range/Performance Problem
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