Check engine light came on when car idle was below norm and car shutoff.the cars idle is low?

this means a mechanical gauge test is required to check actual pressure warm idling if low below 20 psi then the oil pressure pump relief is stuck open or engine bearing are worn

low fuel pressure.. clogged fuel filter..malfuntioning emissions controls...bad auto shutoff relay.. check all..

You need to verify that oil pressure is ok.
They sell gauge at the parts store which has to be connected to the engine block via oil pressure sender hole.
For that , take out oil pressure sender(unscrew) and screw the gauge in to the hole (con thread).Run the engine and see if pressure is ok at idle and on higher RPM.Gauge suppose to have scale (norm. , low , high ).If oil pressure within specs , repl. oil pressure sender.
Or just replace oil pressure sender and see if that helps.They are not expensive ~ $30.00 , gauge probably the same money.

Hi, If you solve engine idle speed fault this will stop warning lights.
Oil preasure falls when engine not at norm rpm because oil pump is not turning fast enough.
Put car on diagnostics to check for any fault codes

Idle sensor is bad. Find a autozone for check engine light they will connect to computer for free, and tell u what codes come up they can give u a printout also.

When it comes on again let a regular shop scan it for you with a good scanner so they can see whats going on. a generic code reader wont do it. if it is stored in memory they can still check it. if the truck runs good idles fine just watch out for anything out of the norm , what about air filter and fuel filter have they been changed ? tune up ? air filters should be changed every 2 to 3 oil changes and fuel filter every 30k depending on fuel quality there. and tune up at 60 to 70 k even though they probaly said 100k.

Sounds like your oil pressure sensor may be faulty. Or your oil level is very low. Your engine should idle as low as 650 rpm without your light coming on.

Sounds like a dirty or faulty, IAC motor. (idle air control motor) It controls your idle speed under load, so vehicle doesn't stall at stop signs etc. Turning wheel, heater on, ac on etc, are all load conditions that it controls the idle for. Have had good luck at removing it, spraying it & port it comes out of on throttle body, with throttle body cleaner, and re-install. Some will take quite a while before they act up again, or may last a week or 2. if it does cure it, and it starts doing it too frequent after cleaning, replace it.

how low does the oil pressure drop?? is it below 40?

it is located on the intake manifold,tocheck turn key on,probe volt.on1st and4th wire of sensor plug normal reading is4 to 5volts if ok,start car let run till norm. temp.probe wires again while car is idling,norm.reading is0.4 to 2volts,if any of these is out of range change sensor