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If the service engine soon light is on ,have you had it checked for DTC'S - diagnostic trouble codes ? When is it hard to start , first time you start it in the morning , or any time , randomly ? You should have a diagnostic scanner hooked up to check engine sensor data parameters .
Error Code: P0154 Description:
Heated Oxygen Sensor (HO2S) 1 , Bank 2 - No Activity Detected Problem areas:
- Open circuit in signal wire, between Heated Oxygen sensor 1, Bank 2 and ECM. (Must check and confirm)
- Heated oxygen sensor (HO2S).
- Engine control module (ECM).
with new gen cars/trucks they show fault code in the form of a eng light on ! If the eng light is on there is a fault on diagnostics = eng management,air flow meter,feul pressure sensor,injectors etc.the trick is to find it ? workshops use a Diagnostic tool (Gen2) for Isuzu,mabe u could ask a alternative tool (launch master)also a diagnostic tool /most aftermarket workshops should be able to diagnose the problem. (this is also the reason your cruise control will not work because of the Eng Light.
It could be any number of things you will nee the codes read to be sure. If yor mileage is near one of the recommended services points 50,000, 100,000 or 150,000 this could be the cause. Again you won't know or sure ill codes are read Good Luck With This
check engine light comes on when ecm detects a problem when information is out of spec.from 1 or more sensors.have ecm scan for problem code!depending on problem,sometimes ecm has bypass mode for some sensors,car will drive ok,or run little rough.but its up to u,if u don t feel safe dont drive it.oil pressure will vary with engine rpm,eng.temp.also,as long the gauges are in the good operating range!hope i could help!