What Does P0172 Mean on Your 2022 Ford Explorer?
The 2022 Ford Explorer offers a 2.3L EcoBoost turbo inline-4 (300 hp), a 3.0L EcoBoost twin-turbo V6 (400 hp in the ST), or a 3.3L V6 hybrid (318 hp combined). P0172 means the PCM detected a rich fuel condition on Bank 1. On the 2.3L, Bank 1 is the only bank. On the 3.0L and 3.3L V6 engines, Bank 1 is one of the two cylinder banks.
The air-fuel ratio is too fuel-rich, and the PCM cannot adequately compensate through normal fuel trim adjustments.
Common Symptoms You Might Notice
- Check engine light on
- Fuel economy worse than EPA ratings
- Fuel smell from exhaust
- Black soot on tailpipe
- Rough idle
- Reduced power or turbo response
Top Causes of P0172 on the 2022 Explorer
- Dirty MAF Sensor (30% likelihood): EcoBoost turbo engines route PCV oil vapor that contaminates the MAF sensor. A dirty sensor underreports airflow and causes over-fueling.
- Faulty Bank 1 O2 Sensor (25% likelihood): The upstream O2 sensor can degrade, providing inaccurate feedback that causes the PCM to over-fuel Bank 1.
- EVAP Purge Valve Issue (25% likelihood): Ford vehicles have a known tendency for purge valve problems. A stuck-open valve sends fuel vapor into the intake.
- Boost or Intake Leak (20% likelihood): On EcoBoost models, charge piping or intercooler leaks can introduce unmetered air that affects fuel calculations.
How to Diagnose P0172 on Your 2022 Explorer
- Check for companion codes. P0175 alongside P0172 on V6 models means both banks are rich. EVAP codes point to the purge valve.
- Inspect the air filter. A dirty filter restricts airflow and contributes to rich running.
- Clean the MAF sensor. Remove, spray with MAF-specific cleaner, and air dry.
- Test the purge valve. Disconnect the purge hose at idle and check for idle quality changes.
- Compare bank fuel trims on V6 models. Bank-specific negative LTFT narrows the search.
Repair Options and Costs
- MAF sensor cleaning: $10 DIY or $60-$100 at a shop
- MAF sensor replacement: $140-$290 parts and labor
- O2 sensor replacement: $180-$380 parts and labor
- EVAP purge valve replacement: $110-$270 parts and labor
- Boost leak repair: $120-$400 depending on component
Can You DIY This Repair?
The 2022 Explorer has a moderately accessible engine bay. The 2.3L EcoBoost is easier to work on than the twin-turbo 3.0L. MAF sensor cleaning is straightforward on all models. The purge valve is moderately accessible. O2 sensor work requires getting under the vehicle. Boost leak diagnosis on the 3.0L twin-turbo is complex and best left to professionals.
Prevention Tips
- Replace air filters every 15,000-20,000 miles
- Clean the MAF sensor every 30,000 miles
- Use top-tier fuel to keep injectors clean
- Follow Ford's maintenance schedule
- Address check engine lights promptly to protect catalytic converters