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Code : P1128
Description : P1128 MITSUBISHI Closed Loop Fueling Not Achieved Bank 1
Possible causes :
– Check fuel trim values
– rich or lean air/fuel ratio
– Open or short circuit condition
– Manifold Absolute Pressure (MAP) Sensor faulty
– Engine Coolant Temperature (ECT) sensor faulty
– Faulty oxygen sensor
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.

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