What P0171 Means on Your 2022 Acura Integra
A P0171 code on your 2022 Acura Integra means the engine control module has detected a lean air-fuel mixture. The 2022 Integra (first year of the revival) is powered by a 1.5L turbocharged four-cylinder engine (L15CA) producing 200 horsepower. Since this is an inline-four, Bank 1 covers the entire engine. A lean condition indicates too much air or insufficient fuel in the combustion mixture.
The Integra shares its powertrain with the Honda Civic Si, so known patterns from that engine apply here too. Here is your guide to fixing P0171.
Symptoms
- Check engine light on
- Rough or inconsistent idle
- Turbo lag or hesitation during acceleration
- Decreased fuel economy
- Possible reduced boost response
- Engine not as peppy as usual
Common Causes on the 1.5L Turbo
- Boost Leak (35% likelihood) - The turbo system's charge pipe connections, intercooler hoses, and hose clamps can loosen or crack. Any leak after the MAF sensor creates a lean condition.
- MAF Sensor Contamination (25% likelihood) - Oil from the PCV system or an aftermarket oiled filter can coat the MAF sensing element.
- Fuel Delivery Issue (20% likelihood) - The direct injection system needs consistent high fuel pressure. A weak high-pressure pump or clogged injector causes lean conditions.
- PCV System Problem (20% likelihood) - A stuck PCV valve or cracked PCV hose can introduce excess air into the intake.
Diagnostic Steps
- Full code scan. Check for boost, misfire, or fuel system codes.
- Monitor fuel trims. LTFT above +10% confirms lean. Check under boost too.
- Inspect turbo plumbing. Check charge pipes, intercooler hoses, clamps.
- Clean MAF sensor. Use MAF-specific cleaner.
- Check PCV system. Inspect valve and hoses for cracks or sticking.
- Test fuel pressure. Verify high-pressure rail readings match spec.
Repair Costs
- Boost pipe or clamp repair: $50 - $250.
- MAF sensor service: $15 - $260.
- PCV valve replacement: $40 - $150.
- High-pressure fuel pump: $400 - $800.
Warranty Information
The 2022 Acura Integra has a 4-year/50,000-mile basic warranty and 6-year/70,000-mile powertrain warranty. If within coverage, the dealer handles the repair for free.
Prevention Tips
- Use OEM air filters to protect the MAF sensor
- Fill up with premium fuel as recommended
- Inspect turbo hoses during routine service
- Avoid aftermarket oiled air filters
- Address check engine lights promptly