What Does P0172 Mean on Your 2020 Ford Edge?
A P0172 code on your 2020 Ford Edge means the engine control module has detected that Bank 1 is running too rich. The 2020 Edge comes with two engine options: the standard 2.0L EcoBoost turbocharged four-cylinder making 250 horsepower, and the 2.7L EcoBoost twin-turbo V6 in the Edge ST producing 335 horsepower. Both engines use direct injection and turbocharging.
On the 2.0L four-cylinder, there is only one bank. On the 2.7L V6, Bank 1 is the rear bank nearest the firewall. A rich condition means excess fuel is entering the combustion chambers, which hurts fuel economy and can cause catalytic converter damage over time.
Common Symptoms You May Notice
- Check engine light on
- Reduced fuel economy
- Rough or uneven idle
- Black smoke from the exhaust
- Fuel smell at the tailpipe
- Sluggish acceleration
Top Causes of P0172 on the 2020 Edge
- Dirty MAF sensor - The mass airflow sensor becomes contaminated over time, causing it to underreport the amount of air entering the engine. This leads the PCM to inject too much fuel.
- Leaking fuel injector - A direct injection injector that does not close properly allows fuel to drip into the cylinder, creating a rich condition.
- Faulty upstream O2 sensor - The Bank 1 upstream oxygen sensor provides feedback for fuel trim adjustments. A slow or inaccurate sensor causes over-fueling.
- Boost leak in turbo system - Any air leak between the turbo, intercooler, and throttle body causes airflow measurement errors.
How to Diagnose the Problem
Start by scanning for codes and reviewing freeze frame data. Focus on Bank 1 short-term and long-term fuel trims. LTFT values more negative than -10% confirm the rich condition.
Inspect the air filter and replace it if needed. Clean the MAF sensor with MAF-specific cleaner. This is the simplest and most commonly effective fix for P0172.
Check the turbo boost hoses and intercooler connections for leaks. On the Edge, these hoses can become loose or cracked over time. A smoke test helps identify small leaks.
Monitor the upstream O2 sensor with live scan data. The voltage should oscillate between 0.1V and 0.9V. If it stays high, the engine is confirmed rich. Test fuel pressure as a final diagnostic step.
Repair Options and Cost Estimates
- MAF sensor cleaning or replacement: Cleaning is under $10. New sensor costs $55-$170 plus $50-$100 labor.
- Fuel injector replacement: Parts cost $45-$120 each. Labor is $175-$375.
- O2 sensor replacement: Parts run $55-$155. Labor is $75-$145.
- Boost leak repair: Hoses and clamps cost $20-$75. Labor is $75-$180.
Can You Fix This Yourself?
MAF sensor cleaning is quick and easy for anyone. O2 sensor replacement requires jack stands and a sensor socket but is manageable for DIY mechanics. Fuel injector replacement is more advanced due to the high-pressure direct injection system.
Prevention Tips
- Replace the air filter every 15,000-20,000 miles
- Use quality fuel from reputable stations
- Run fuel system cleaner through the tank periodically
- Address check engine lights promptly to prevent catalytic converter damage