'Engine System Service Required' message on screen (with picture of MIL light in message display but actual MIL light not on).

Problem Summary: Full vehicle scan, many codes in various modules, but in PCM:
P155168 Cylinder 1 injector circuit range/performance, Algorithm based faults, Eventinformation
P155268 Cylinder 2 injector circuit range/performance, Algorithm based faults, Eventinformation
P155468 Cylinder 4 injector circuit range/performance, Algorithm based faults, Eventinformation
P155368 Cylinder 3 injector circuit range/performance, Algorithm based faults, Eventinformation
P2A002F Oxygen circuit range/performance (bank 1 sensor 1), General signal faults,Signal erratic
P200000 Nitrogen Oxide (NOx) trap efficiency below threshold (bank 1), General faultinformation, No sub-type information
P252F00 Engine oil level too high, General fault information, No sub-type information
U016700 Lost communication with vehicle immobilizer control module, General faultinformation, No sub-type information