What Does P0172 Mean on Your 2022 Chevrolet Equinox?
When your 2022 Chevrolet Equinox throws a P0172 code, the engine control module is reporting that the engine is running too rich. The 2022 Equinox uses a 1.5L turbocharged four-cylinder engine making 170 horsepower and 203 lb-ft of torque. Since this is an inline-four, there is only one bank, so P0172 affects the entire engine's fuel mixture.
A rich condition means the air-fuel mixture has excess fuel. This wastes gas, can foul spark plugs, and stresses the catalytic converter. Getting it fixed early prevents more expensive repairs down the road.
Common Symptoms You May Notice
- Check engine light illuminated
- Lower fuel economy than expected
- Rough or fluctuating idle
- Black exhaust smoke
- Gasoline odor from the tailpipe
- Reduced acceleration
Top Causes of P0172 on the 2022 Equinox
- Contaminated MAF sensor - The mass airflow sensor picks up contamination from road dust and oil film. A dirty MAF underreports airflow, causing the ECM to inject too much fuel.
- Turbo boost leak - The 1.5L turbo system has charge pipes and intercooler connections that can develop leaks at hose clamps or connections.
- Failing O2 sensor - The upstream oxygen sensor may degrade over time, sending inaccurate voltage readings to the ECM.
- Stuck-open EVAP purge valve - A purge valve that does not close allows excess fuel vapors to enter the intake manifold.
How to Diagnose the Problem
Use an OBD-II scanner to pull codes and freeze frame data. Check STFT and LTFT values. Negative LTFT beyond -10% confirms the rich running condition.
Start with the air filter. Replace it if it looks dirty. Clean the MAF sensor with proper MAF cleaner spray. On the Equinox, the MAF is in the intake tube between the air filter box and the turbo inlet.
Check all turbo charge pipe connections and intercooler hoses. A smoke test can reveal small leaks that are hard to find visually.
Monitor the upstream O2 sensor with live data. A healthy sensor oscillates between 0.1V and 0.9V. Test the EVAP purge valve for proper operation.
Repair Options and Cost Estimates
- MAF sensor cleaning or replacement: Cleaning is under $10. New sensor costs $40-$135 plus $40-$85 labor.
- Boost leak repair: Parts run $15-$55. Labor is $55-$140.
- O2 sensor replacement: Parts cost $40-$130. Labor is $60-$120.
- EVAP purge valve: Parts are $20-$50. Labor runs $45-$90.
Can You Fix This Yourself?
The Equinox is relatively DIY-friendly. MAF cleaning takes 15 minutes. Checking boost hoses requires no special tools. O2 sensor replacement is moderate difficulty. EVAP purge valve replacement is usually straightforward.
Prevention Tips
- Replace the air filter every 15,000-20,000 miles
- Use quality fuel to minimize deposits
- Check boost hose connections periodically
- Run a fuel system cleaner every 5,000 miles