2022 Buick P0172: What It Means & Is It Safe to Drive?
P0172 on the 2022 Buick: 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 2022 Buick
- 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 2022 Buick, repairs for P0172 typically fall between $100 and $600, depending on the root cause and labor rates in your area.
Known issues on Buick
Buick P0172 rich condition on the 3.6L LFX is often caused by a leaking fuel injector or a stuck-open purge solenoid flooding the intake with EVAP vapor. On 2.0T Ecotec turbo, a leaking boost pressure sensor or a failed MAP sensor can also cause over-fueling.
Most commonly affected models
Enclave 3.6L 2008–2017Regal 2.0T 2011–2017LaCrosse 3.6L 2010–2016