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P0172 Oldsmobile

P0172 Oldsmobile - Fuel Trim System Rich Bank 1

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P0172 Oldsmobile Comments |  Add Comment
Possible causes
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Faulty Mass Air Flow (MAF) sensor
Help with Possible causes What does this mean?
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
Help with Tech Notes What does this mean?
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.)
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
P0172 Oldsmobile 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.

OLDSMOBILE Technical Service Bulletins for P0172 code
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2003 OLDSMOBILE BRAVADA Electrical System Details
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More Bulletins Help with Technical Service Bulletins What does this mean?
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