AutoCodes - Buick - P0172 BUICK

P0172 BUICK Code - Fuel Trim System Rich Bank 1

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|P0172 BUICK code possible causes

  • Faulty Front Heated Oxygen Sensor
  • Faulty Spark Plugs
  • Faulty Mass Air Flow (MAF) sensor
  • Exhaust Gas Leaks
  • Ignition Misfiring
  • Incorrect Fuel Pressure
  • Faulty Fuel Injectors

|How do I fix the P0172 BUICK code?

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's pins.

|P0172 BUICK code tech notes

There is a Factory Service Bulletin for all 2000-2013 Buick models:
2000-2013 Buick Factory Service Bulletin OBDII Code P0172

|Cost of diagnosing the P0172 BUICK code

Labor: 1.0

The cost of diagnosing the P0172 BUICK code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0172 BUICK code detected?

- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.)

|What are P0172 BUICK code possible symptoms?

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

|P0172 BUICK code description

The Engine Control Module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open Loop and Closed Loop. During Open Loop, the ECM determines fuel delivery based on sensor signals without heated oxygen sensor (HO2S) input. During Closed Loop, the ECM adds HO2S inputs to calculate the short and long term fuel trim (FT) adjustments. If the HO2S indicates a lean condition, the fuel trim values will be above 0 percent. If the HO2S indicates a rich condition, the FT values will be below 0 percent. The short term FT values change rapidly in response to the HO2S voltage signals. The long term FT makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1.
OBDII Code P0172 Buick - Fuel Trim System Rich Bank 1 - AutoCodes.com

|Need more information with the P0172 BUICK code?

Need more information on how to fix the P0172 BUICK code? Get Access to Factory Service Manuals

|Need help with a P0172 BUICK code?

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|P0172 BUICK code comments

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Repair Importance Level: 3
 
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