P0100 on Your 2017 Honda Accord
A P0100 code on your 2017 Honda Accord means the ECM has found a malfunction in the mass air flow (MAF) sensor circuit. As the final year of the 9th-generation Accord, your 2017 model has nearly a decade of service, making MAF issues a common clue to investigate.
The 2017 Accord is available with a 2.4L inline-four or a 3.5L V6. Both use the MAF sensor for fuel metering, and both have accessible sensor locations for DIY work.
Symptoms
- Check engine light on
- Rough or fluctuating idle
- Hesitation and lack of power on acceleration
- Poor fuel economy
- Intermittent stalling
- Black smoke in severe cases (V6)
Common Causes
- Contaminated MAF sensor (40%) — Eight-plus years of accumulated contamination. The 2.4L's PCV system can contribute oil mist, while the V6's larger airflow volume collects more debris over time.
- Corroded wiring and connectors (23%) — Age-related electrical degradation. Connector corrosion is common at this age, particularly in humid or salt-belt climates.
- Failed MAF sensor (17%) — The sensor reaching end of service life.
- Intake tract leaks (12%) — Hardened and cracked rubber intake components after years of heat cycles.
- Neglected air filter (5%) — Long-overdue replacement.
- ECM fault (3%) — Unlikely but possible with age.
DIY Diagnostic Steps
- MAF sensor cleaning — Remove and clean with MAF cleaner spray. At this age, always start here. The sensor is in the intake tube between the air filter box and throttle body.
- Connector cleaning — Remove the connector, inspect for corrosion, clean with electrical contact cleaner, apply dielectric grease.
- Air filter replacement — Install a fresh OEM-style paper filter.
- Intake inspection — Check all rubber boots, hoses, and clamps for cracks or looseness.
- Scan tool check — Verify MAF readings at idle and under load.
- MAF replacement — If cleaning doesn't resolve the code.
Repair Costs
- MAF cleaning: $10–$15 (DIY)
- Air filter: $12–$25 (DIY)
- MAF sensor (2.4L): $110–$260
- MAF sensor (V6): $130–$300
- Intake boot: $60–$170
- Wiring repair: $85–$250
Warranty
All factory warranties on your 2017 Accord have expired. The federal emissions warranty (8 years/80,000 miles) expired in 2025. This is a DIY or independent shop repair. The 9th-gen Accord's straightforward engine layout makes MAF work accessible.