P2097 - Post Catalyst Fuel Trim System Too Rich Bank 1

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?
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Possible causes
- Exhaust leak near O2 sensor
- Faulty O2 sensor
- Fuel contamination
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P2097 Description

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the engine control module (ECM) operates in an open loop mode, ignoring the HO2S signal voltage while calculating the air to fuel ratio. The ECM supplies the HO2S with a reference, or bias voltage of about 450 mV. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1 000 mV. This voltage will fluctuate above and below the bias voltage. Once sufficient HO2S voltage fluctuation is observed by the ECM, closed loop is entered. The ECM uses the HO2S voltage to determine the air to fuel ratio. An HO2S voltage that increases above bias voltage toward 1 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture.

P2097 Information for specific makes
P2097 BUICK Post Catalyst Fuel Trim System Too Rich Bank 1
P2097 CADILLAC Post Catalyst Fuel Trim System Too Rich Bank 1
P2097 CHEVROLET Post Catalyst Fuel Trim System Too Rich Bank 1
P2097 CHRYSLER Downstream Fuel Trim System 1 Rich
P2097 DODGE Downstream Fuel Trim System 1 Rich
P2097 FORD Post Catalyst Fuel Trim System Too Rich Bank 1
P2097 GMC Post Catalyst Fuel Trim System Too Rich Bank 1
P2097 HYUNDAI Post Fuel Trim Too Rich-B1
P2097 INFINITI Post Catalytic Fuel Trim System Too Rich Bank 1
P2097 JEEP Downstream Fuel Trim System 1 Rich
P2097 LINCOLN Post Catalyst Fuel Trim System Too Rich Bank 1
P2097 MERCURY Post Catalyst Fuel Trim System Too Rich Bank 1
P2097 NISSAN Post Catalytic Fuel Trim System Too Rich Bank 1
P2097 SUBARU Post Catalyst Fuel Trim System Too Rich Bank 1
Related Information
Repair Importance Level: 3
 
1=Low 2=Medium 3=High What does this mean?
Repair Difficulty Level: 3
 
1=Easy 2=Moderate 3=Hard What does this mean?
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