2007 Mazda P0172: What It Means & Is It Safe to Drive?
P0172 on the 2007 Mazda: 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 2007 Mazda
- 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 2007 Mazda, repairs for P0172 typically fall between $100 and $600, depending on the root cause and labor rates in your area.
Known issues on Mazda
Mazda P0172 on naturally aspirated MZR engines is typically a stuck-open purge solenoid or a leaking fuel injector. On the CX-7 2.3T turbo, a failing boost pressure sensor can cause incorrect fuel mapping—check boost sensor and intercooler integrity alongside P0172.
Most commonly affected models
Mazda3 2.0L MZR 2004–2009Mazda6 2.3L 2003–2008CX-7 2.3T 2007–2012