2019 Honda Accord P0100 Code: Mass Air Flow Circuit Malfunction Guide

Investigating P0100 on Your 2019 Honda Accord

A P0100 code on your 2019 Honda Accord signals a malfunction in the mass air flow (MAF) sensor circuit. After six years of service, MAF contamination and age-related electrical issues become increasingly common causes.

Your 10th-generation Accord (2018–2022) uses either the 1.5L turbocharged engine or the 2.0L turbocharged engine. Both rely on the MAF sensor for accurate fuel metering, and both offer straightforward MAF access for diagnosis.

Symptoms

• Check engine light on
• Rough idle
• Hesitation on acceleration
• Reduced power and throttle response
• Decreased fuel economy
• Possible stalling at low RPM

Common Causes

1. Contaminated MAF sensor (36%) — Six years of accumulated oil, dust, and PCV system residue. Aftermarket oiled air filters compound the issue.
2. Wiring or connector deterioration (22%) — Connector corrosion and wiring harness fatigue from heat cycling.
3. Faulty MAF sensor (18%) — Sensor degradation over time.
4. Intake air leak (13%) — Aging rubber boots or intercooler piping developing cracks or loosening at clamps.
5. Air filter neglect (7%) — Overdue filter change restricting airflow.
6. ECM issue (4%) — Rare at this age.

Diagnostic Steps

1. MAF sensor cleaning — Remove and clean with dedicated MAF cleaner spray. This is the most cost-effective first step.
2. Connector inspection — Check for corroded or bent pins, apply dielectric grease after cleaning.
3. Air filter replacement — Replace with OEM-style paper filter.
4. Intake inspection — Check boots, clamps, and intercooler piping for leaks.
5. Scan tool verification — Confirm MAF readings return to proper range.
6. MAF replacement — If readings stay out of spec after cleaning.

Repair Costs

• MAF cleaning: $10–$15 (DIY)
• Air filter: $15–$28 (DIY)
• MAF sensor: $140–$330
• Intake boot/piping: $80–$210
• Wiring repair: $95–$270

Warranty

Your 2019 Accord's basic warranty has expired. The federal emissions warranty covers the MAF sensor for 8 years/80,000 miles through 2027. Check your mileage—you may still qualify for dealer coverage.