P0175 Ford Bronco
System Too Rich (Bank 2) · Powertrain Code · Medium · Repair: Moderate
What is P0175?
The engine is running rich on bank 2. Same causes as P0172 but affecting the opposite cylinder bank.
When the Ford Bronco triggers code P0175 (system too rich (bank 2)), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Ford Bronco.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Ford Bronco.
Common Causes on Ford Bronco
- Stuck-open EVAP purge valve — same failure mode as P0172 but on bank 2
- Dirty MAF sensor under-reading airflow
- Leaking fuel injector(s) on bank 2 (cylinders 4-6 on V6, 5-8 on V8)
- Vacuum leak at the PCV valve or intake manifold
Symptoms
- Check engine light
- Rich exhaust smell
- Black smoke under load
- Decreased fuel economy
- Rough idle or misfire
Notes for Ford Bronco
When P0172 and P0175 appear together on a Ford, the EVAP purge valve is almost always the culprit — it affects both banks equally.