What Does P0172 Mean on Your 2024 Acura Integra?
A P0172 diagnostic trouble code on your 2024 Acura Integra means the engine control module has detected that the air-fuel mixture is running too rich. The 2024 Integra features a 1.5-liter turbocharged 4-cylinder engine producing 200 hp in the base model and 320 hp in the Type S with a 2.0-liter turbo. On both inline-4 engines, there is only one bank, so P0172 covers the entire engine.
Too rich means the engine is burning more fuel than the ideal 14.7:1 ratio. This wastes gas, increases harmful emissions, and can cause damage to the catalytic converter over time.
Symptoms You May Notice
- Check engine light on
- Reduced fuel economy below the rated 30/37 mpg (1.5T) or 24/32 mpg (Type S)
- Rough or lumpy idle
- Black smoke from the exhaust
- Gas smell at the tailpipe
- Hesitation or flat spots during acceleration
- Spark plug fouling over time
Common Causes of P0172 on the 2024 Acura Integra
- Contaminated MAF Sensor - The most frequent cause. The mass airflow sensor can get coated with oil vapor from the turbo intake, causing incorrect air measurement and over-fueling.
- Intake or Boost Leak - Cracks or loose clamps in the charge pipe system after the turbo let pressurized air escape, creating a mismatch between expected and actual airflow.
- Leaking Fuel Injector - The 1.5T uses both port and direct injection. The 2.0T Type S uses direct injection only. A leaking injector on either system causes excess fuel delivery.
- Faulty Upstream Oxygen Sensor - A degraded O2 sensor sending incorrect data to the ECM results in the computer adding more fuel than needed.
How to Diagnose P0172
- Pull all diagnostic codes - Look for companion codes for MAF, boost, O2, or misfire faults.
- Check fuel trim data - Negative long-term fuel trims confirm rich operation.
- Clean and test the MAF sensor - This should always be the first diagnostic step on turbocharged Honda/Acura engines.
- Boost leak test - Pressurize the intake system and check all connections for leaks.
- Monitor O2 sensor data - Check response time and voltage range of the upstream sensor.
- Test fuel injectors - Run balance and leak-down tests on all injectors.
Repair Options and Cost Breakdown
- MAF Sensor Cleaning - $12-$25 for spray cleaner. Easy DIY in 10 minutes.
- MAF Sensor Replacement - $130-$290 parts and labor.
- Boost Hose or Pipe Repair - $60-$300 depending on the part.
- Fuel Injector Replacement - $250-$600 per injector with labor. Type S direct injection may cost more.
- O2 Sensor Replacement - $150-$330 including parts and labor.
The typical repair cost for P0172 on the 2024 Integra is between $100 and $350. The Integra is a more affordable Acura, so parts and labor tend to be reasonable.
Can You DIY This Repair?
Yes, many P0172 repairs are DIY-friendly on the Integra. The engine bay is accessible, and the 1.5T platform is shared with the Honda Civic, meaning there are plenty of guides and forums available. MAF cleaning and boost hose inspection are easy home jobs. Injector work is better left to a professional.
Prevention Tips
- Replace the air filter every 15,000 miles
- Use quality fuel from reputable gas stations
- Add fuel system cleaner every 10,000 miles to keep injectors clean
- Inspect boost hose connections at each oil change interval
- Address check engine lights early to avoid catalytic converter damage