What Does P0172 Mean on Your 2022 Lincoln Aviator?
A P0172 code on your 2022 Lincoln Aviator means the PCM has detected a rich air-fuel mixture on Bank 1. The 2022 Aviator is powered by a 3.0-liter twin-turbocharged V6 producing 400 hp (or 494 hp in the Grand Touring plug-in hybrid), paired with a 10-speed automatic transmission. Bank 1 is the cylinder bank containing cylinder number 1.
The twin-turbo direct injection engine provides excellent performance but has multiple areas where fuel system issues can develop. Running rich means excess fuel is entering the combustion chambers.
Symptoms You May Notice
- Check engine light on
- Fuel economy below the rated 18/26 mpg
- Rough or unsteady idle
- Black exhaust smoke
- Fuel smell from the exhaust
- Reduced power or turbo response
- Misfires on Bank 1
Common Causes of P0172 on the 2022 Lincoln Aviator
- Dirty MAF Sensor - Oil vapor from the twin-turbo system can contaminate the MAF sensor, causing it to underreport airflow and trigger over-fueling.
- Boost System Leak - The twin-turbo charge piping and intercooler system have multiple connection points where leaks can develop.
- Leaking Fuel Injector on Bank 1 - Direct injection injectors operate at extreme pressures and can develop leaks over time.
- Faulty Bank 1 O2 Sensor - A sluggish upstream oxygen sensor on Bank 1 causes the PCM to add excess fuel.
How to Diagnose P0172
- Scan all codes - Check for P0175, boost, MAF, and O2 companion codes.
- Review fuel trims - Negative Bank 1 LTFT beyond -10% confirms the rich condition.
- Clean the MAF sensor - The best and cheapest first step.
- Boost leak test - Pressurize the intake and check all connections.
- Monitor O2 sensors - Check Bank 1 Sensor 1 response time.
- Test fuel injectors - Check for leaks and balance on Bank 1.
Repair Options and Cost Breakdown
- MAF Sensor Cleaning - $15-$30 DIY.
- MAF Sensor Replacement - $200-$430 parts and labor.
- Boost Pipe Repair - $130-$500 depending on the component.
- Fuel Injector Replacement - $400-$850 per injector with labor.
- O2 Sensor Replacement - $240-$450 parts and labor.
Most P0172 repairs on the Aviator cost between $220 and $550. The Aviator is a premium luxury SUV with correspondingly higher parts costs.
Can You DIY This Repair?
MAF sensor cleaning is feasible as a DIY task. The Aviator engine bay is tighter than the Navigator but still accessible for basic work. Boost hose inspection is manageable. Fuel injector and turbo work require professional expertise and specialized tools.
Prevention Tips
- Replace the air filter every 15,000-20,000 miles
- Use quality fuel from top-tier stations
- Add fuel system cleaner every 10,000 miles
- Have the twin-turbo system inspected during routine service
- Address check engine lights promptly