Engine-Codes
 
OBDII Code List
 
P0172 OLDSMOBILE

P0172 OLDSMOBILE - Fuel Trim System Rich Bank 1

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

P0172 OLDSMOBILE Possible Causes

  • Faulty front heated oxygen sensor
  • Ignition misfiring
  • Faulty fuel injectors
  • Exhaust gas leaks
  • Incorrect fuel pressure
  • Faulty Mass Air Flow (MAF) sensor

First diagnose P0172 OLDSMOBILE 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 terminals.

P0172 OLDSMOBILE Tech Notes

There is a factory service bulletin for the following Oldsmobile models:

2000-2004 Oldsmobile Alero
2000-2005 Oldsmobile Silhouette
2002-2004 Oldsmobile Bravada
2000-2004 Oldsmobile Factory Service Bulletin OBDII Code P0172

Cost of diagnosing the P0172 OLDSMOBILE code

    Labor: 1.0

    The cost of diagnosing the P0172 OLDSMOBILE code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

When is the P0172 OLDSMOBILE code detected?

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

P0172 OLDSMOBILE Possible Symptoms

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

P0172 OLDSMOBILE Meaning

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 OLDSMOBILE - Fuel Trim System Rich Bank 1 - Engine-Codes.com

P0172 OLDSMOBILE More Information

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