P0172 OLDSMOBILE - Fuel Trim System Rich Bank 1
P0172 OLDSMOBILE 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 is the P0172 OLDSMOBILE code repair?Start by checking 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.
2000-2004 Oldsmobile Alero
2000-2005 Oldsmobile Silhouette
2002-2004 Oldsmobile Bravada
2000-2004 Oldsmobile Factory Service Bulletin OBDII Code P0172
What is the cost to diagnose the P0172 OLDSMOBILE code
Labor: 1.0The cost to diagnose the P0172 OLDSMOBILE 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.
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When is the code detected?- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.)
- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
P0172 OLDSMOBILE MeaningThe 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.
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