P0171 on Your 2024 Acura Integra
A P0171 code on your 2024 Acura Integra means the ECM detected a lean air-fuel mixture. The 2024 Integra uses a 1.5L turbocharged four-cylinder producing 200 horsepower in standard form, or the 2.0L turbo (K20C1) with 320 horsepower in the Type S. Both are inline-four engines where Bank 1 covers all cylinders. A lean condition means too much air or insufficient fuel.
As a 2024 model, your Integra is under Acura's comprehensive warranty. Here is what you need to know.
Symptoms
- Check engine light on
- Rough or uneven idle
- Turbo hesitation or lag
- Reduced fuel economy
- Possible reduced boost
- Engine not as responsive
Common Causes
- Boost Leak (35% likelihood) - Factory assembly issues with turbo hose connections or clamps can let pressurized air bypass the MAF sensor.
- MAF Sensor Issue (25% likelihood) - A factory-defective or contaminated MAF sensor can misread airflow.
- Fuel System Defect (20% likelihood) - A defective injector or high-pressure fuel pump.
- ECM Calibration (20% likelihood) - Honda/Acura may have a software update addressing fuel trim behavior.
Diagnostic Steps
- Dealer TSB check. Have the dealer search for bulletins for the 2024 Integra.
- Fuel trim monitoring. LTFT above +10% confirms lean.
- Turbo plumbing inspection. Check all connections, clamps, and hoses.
- MAF evaluation. Compare readings to factory specs.
- Software check. An ECM reflash may be available.
Repair Costs
- Under warranty: $0. Fully covered.
- Boost pipe repair (out of warranty): $50 - $250.
- MAF sensor (out of warranty): $150 - $280.
- Fuel system (out of warranty): $300 - $850.
- ECM reflash (out of warranty): $100 - $200.
Acura Warranty
The 2024 Integra has a 4-year/50,000-mile basic warranty and 6-year/70,000-mile powertrain warranty. P0171 is covered. Take it to an authorized Acura dealer.
Prevention Tips
- Use OEM air filters
- Fill up with premium fuel
- Avoid aftermarket intake modifications
- Respond to check engine lights promptly
- Follow the factory maintenance schedule