P1128 - Closed Loop Fueling Not Achieved Bank 1

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?
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Possible causes
- Fuel delivery system
- Manifold Absolute Pressure (MAP) sensor or wiring connectors
- O2 sensor wiring or connectors
- Engine mechanical system
- Faulty Powertrain Control Module (PCM)
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1128 Description

The Powertrain Control Module (PCM) detects a condition where the vehicle has remained in open loop fuel control, from a start-up condition, longer than a calibrated amount of time, when conditions would have otherwise closed loop operation.

P1128 Information for specific makes
P1128 ACURA Manifold Absolute Pressure Sensor Signal Lower Than Expected
P1128 AUDI Long Term Fuel Trim B1 System Too Lean
P1128 CHRYSLER Closed Loop Fueling Not Achieved Bank 1
P1128 DODGE Closed Loop Fueling Not Achieved Bank 1
P1128 FORD Front O2 Sensor Connectors Swapped
P1128 HONDA Manifold Absolute Pressure Sensor Signal Lower Than Expected
P1128 HYUNDAI Fuel System Lean Part Load
P1128 INFINITI Throttle Control Motor Circuit Short
P1128 ISUZU MAP Sensor Voltage Lower Than Expected
P1128 JEEP Closed Loop Fueling Not Achieved Bank 1
P1128 LEXUS Throttle Control Motor Lock Malfunction
P1128 LINCOLN Front O2 Sensor Connectors Swapped
P1128 MAZDA HO2S Heater O2 Sensor Too Cool Before KOER Test
P1128 MERCURY Front O2 Sensor Connectors Swapped
P1128 MITSUBISHI Closed Loop Fueling Not Achieved Bank 1
P1128 NISSAN Throttle Control Motor Circuit Short
P1128 TOYOTA Throttle Control Motor Lock Malfunction
P1128 VOLKSWAGEN Long Term Fuel Trim B1 System Too Lean
Related Information
Repair Importance Level: 3
 
1=Low 2=Medium 3=High What does this mean?
Repair Difficulty Level: 2
 
1=Easy 2=Moderate 3=Hard What does this mean?
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