P2096 - Post Catalyst Fuel Trim System Too Lean Bank 1

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?
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Possible causes
- Faulty Heated Oxygen Sensor
- Heated Oxygen Sensor harness is open or shorted
- Heated Oxygen Sensor circuit poor electrical connection
- Exhaust leaks
- Contaminated Heated Oxygen Sensor
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P2096 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.

P2096 Information for specific makes
P2096 AUDI Post Catalyst Fuel Trim System Too Lean
P2096 BMW Post Catalyst Fuel Trim System Too Lean Bank 1
P2096 BUICK Post Catalyst Fuel Trim System Too Lean Bank 1
P2096 CADILLAC Post Catalyst Fuel Trim System Too Lean Bank 1
P2096 CHEVROLET Post Catalyst Fuel Trim System Too Lean Bank 1
P2096 CHRYSLER Downstream Fuel Trim System 1 Lean
P2096 DODGE Downstream Fuel Trim System 1 Lean
P2096 FORD Post Catalyst Fuel Trim System Too Lean Bank 1
P2096 GMC Post Catalyst Fuel Trim System Too Lean Bank 1
P2096 HYUNDAI Post Catalyst Fuel Trim System Too Lean
P2096 INFINITI Post Catalytic Fuel Trim System Too Lean Bank 1
P2096 JEEP Downstream Fuel Trim System 1 Lean
P2096 KIA Post Catalyst Fuel Trim System Too Lean
P2096 LINCOLN Post Catalyst Fuel Trim System Too Lean Bank 1
P2096 MAZDA Target AF Feedback System Too Lean Right Bank
P2096 MERCURY Post Catalyst Fuel Trim System Too Lean Bank 1
P2096 MITSUBISHI Downstream Fuel Trim System 1 Lean
P2096 NISSAN Post Catalytic Fuel Trim System Too Lean Bank 1
P2096 SUBARU Post Catalyst Fuel Trim System Too Lean
P2096 SUZUKI Post Catalyst Fuel Trim System Too Lean
P2096 VOLKSWAGEN Post Catalyst Fuel Trim System Too Lean
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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