P0100 on Your 2023 Honda Civic
A P0100 code on your 2023 Honda Civic indicates the ECM has detected a malfunction in the mass air flow (MAF) sensor circuit. This sensor measures incoming air volume, and when its circuit fails, the ECM can't properly calculate fuel delivery, causing driveability issues.
The 11th-generation Civic (2022+) uses either a 2.0L naturally aspirated or 1.5L turbocharged engine, both relying on accurate airflow measurement for optimal performance and emissions.
Symptoms
- Check engine light on
- Rough or unstable idle
- Hesitation during acceleration
- Reduced power and sluggish throttle response
- Poor fuel economy
- Possible stalling at idle
Common Causes
- Contaminated MAF sensor (35%) — Oil, dirt, or debris on the sensing element. Aftermarket oiled air filters are a common source of contamination.
- Damaged wiring or connector (22%) — Corroded pins, chafed wiring, or loose connector at the MAF sensor.
- Faulty MAF sensor (18%) — Internal sensor failure causing erratic or no signal.
- Intake air leak after MAF (12%) — Cracked intake boot or loose clamp allowing unmetered air.
- Restricted air filter (8%) — Severely clogged filter altering airflow patterns.
- ECM issue (5%) — Rare fault in the ECM's MAF circuit processing.
Diagnostic Steps
- Scan tool data — Check MAF sensor readings for consistency and proper range.
- Visual inspection — Check connector, wiring, and intake boot for damage.
- Air filter inspection — Look for excessive contamination or oiled filter residue.
- MAF sensor cleaning — Use dedicated MAF cleaner spray on the sensing element.
- Intake leak check — Inspect all connections between air filter and throttle body.
- MAF sensor replacement — If cleaning doesn't resolve the issue.
Repair Costs
- MAF sensor cleaning: $10–$15 (DIY)
- Air filter: $15–$30 (DIY)
- MAF sensor replacement: $150–$340
- Intake boot repair: $80–$200
- Wiring repair: $100–$300
Warranty
Your 2023 Civic is covered under Honda's 3-year/36,000-mile warranty through 2026 and the federal emissions warranty for 8 years/80,000 miles through 2031. The MAF sensor is emissions-related—check dealer coverage.