2017 Honda P0172: What It Means & Is It Safe to Drive?
P0172 on the 2017 Honda: System Too Rich (Bank 1). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
PowertrainMedium urgency
What this code means
Too much fuel relative to air. O2 sensor detects low oxygen in exhaust; PCM is reducing fuel trim.
Common causes on the 2017 Honda
- Faulty MAF or O2 sensor
- Leaking fuel injector(s)
- High fuel pressure
- Faulty purge valve stuck open
Symptoms
- Check Engine Light
- Rich smell, black smoke
- Poor fuel economy
- Rough idle possible
Typical fixes
- Replace MAF or O2 sensor
- Test fuel pressure and injectors
- Replace purge valve if stuck open
Repair cost range
For a 2017 Honda, repairs for P0172 typically fall between $100 and $600, depending on the root cause and labor rates in your area.
Known issues on Honda
Honda P0172 frequently comes from a leaking fuel pressure regulator or a stuck-open fuel injector. On K-series engines, a failed EVAP purge valve stuck open can also flood the intake with fuel vapor.
Most commonly affected models
Accord 2003–2012CR-V 2002–2011Odyssey 2005–2010