Staff Answer
Jul 21, 2026 - 12:40 PM
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Method 1: Check for Vacuum Leaks
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Action: Inspect all vacuum hoses, rubber intake boots, and the PCV hose for cracks, dry rot, or disconnections. Unmetered air entering the engine past the mass airflow sensor is a primary cause of a lean condition in Acura vehicles.
Method 2: Clean the Mass Air Flow (MAF) Sensor
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Action: Remove the MAF sensor from the air intake assembly and spray it thoroughly with dedicated MAF sensor cleaner. Allow it to dry completely before reinstalling; a contaminated or dirty sensor under-reports incoming airflow, causing the computer to deliver insufficient fuel.
Method 3: Inspect the Fuel Delivery System (Fuel Pump and Injectors)
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Action: Check fuel pressure at the rail to ensure the fuel pump and fuel filter are operating within factory specifications. Additionally, inspect the fuel injectors for clogs or restricted flow that prevents proper fuel delivery to Bank 2.
Warning: Driving with a persistent lean condition (P0174) can cause engine hesitation, rough idling, poor fuel economy, and potentially lead to engine overheating or internal engine damage over time.
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