Engine-Codes - Acura - P0172 Acura

P0172 Acura Code - Fuel System Too Rich Bank 1

- Code Popularity: 37,101 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0172 Acura?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Fuel Pump
  • Faulty Fuel Injector
  • Fuel Pressure Regulator
  • Fuel line failure
  • Fuel supply system failure
  • Faulty Mass Air Flow (MAF) Sensor
  • Faulty Manifold Absolute Pressure (MAP) Sensor
  • Faulty A/F Sensor (Sensor 1)
  • Faulty Secondary HO2S (Sensor 2)
  • Vacuum hose mis installed
  • Throttle body air leak
  • Intake manifold air leak
  • Faulty EVAP Canister Purge Valve
⚠ Does your Acura have Safety Recalls? → Check here

How to Fix the DTC P0172 Acura?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0172 Acura code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Excessive Fuel Consumption

What Does the P0172 Acura Code Mean?

The Powertrain Control Module (PCM) detects the oxygen content in the exhaust gas from the Air/Fuel Ratio (A/F) Sensor (Sensor 1) signal voltage, and it uses fuel feedback control to maintain the optimal air/fuel ratio. The air/fuel ratio coefficient for correcting the amount of injected fuel is the short-term fuel trim. The PCM varies short-term fuel trim continuously to keep the air/fuel ratio close to the stoichiometric ratio for all driving conditions. Long-term fuel trim is computed from short-term fuel trim and is used to regulate long-term deviation from the stoichiometric air/fuel ratio, which occurs when fuel metering components deteriorate with age or system failures occur. In addition, long-term fuel trim is stored in the PCM memory and is used to determine when fuel metering components malfunction. When long-term fuel trim is higher than normal, which is about 1 (0 %), the amount of injected fuel must be increased, and when lower than normal, it must be decreased. If long-term fuel trim is normal (too rich) or less, the PCM detects a malfunction in the fuel metering components and stores a Diagnostic Trouble Code (DTC).

P0172 Acura Code - Fuel System Too Rich Bank 1

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