Oil light comes on under deceleration.oil levels are fine

the first thing to do is to have the oil pressure read using a mechanical gauge
that ensures that you know that the engine is running with the right oil pressure
you can test the ECM operation by using a substitute ECM that is a known good unit
run the fault codes to see in the oil pressure sensor is a problem
At this point , test the oil pressure as suggested then change the oil pressure sensor

What is your fuel pressure

Most likely it is the float level switch that is going bad in the fuel tank. This will poop a code. have it checked. Just keep track of your mpg/kpg.

Okay What it means is that the oil in your car is either low in level or the oil pressure at low revolutions is low. I highly recommend you to stop driving the car when this happen because you can internally damage the engine with a low oil or a low pressure of oil. Check the oil level first..make sure level is fine and oil looks good. Black and burned oil will give you a low oil pressure as well. If it happen that your car need a oil change. Make sure you get it done and see if the problem goes away. Very rarely oils pressure sensor goes bad but if oil is new and level is fine you can take the oil pressure sensor and connect a tester for a oil pressure. If this is not under the manufacturer specifications.. oil pump is worn out and you have to replace it for a new one.
Good luck and don't forget to rte me. Thanks

This is probably a problem with the orange headlight relay under the hood in the relay black box. Take the relay out and clean contacts and put back in. If does not fix, try a new relay or swap with another 9-5 to troubleshoot.

Have the oil pressure checked to make sure that the light is correct,or change the oil sending unit.

change oil pressure switch it' should be near the oil filter

Oil pressure sensor blocked or faulty. both oil level sensor and oil pressure sensor activate the oil light. engine goes into safe mode and shuts off ignition.

yes. switch to synthethic. you will feel a huge difference in performance, epecially at take off. you will also get longer life out of the engine. you can never go wrong with synthetic

To check the oil level open the boot - at the very back remove the 4 plastic clips that hold the carpet in place. Slightly to the left of the center there are 2 holes - shine a light in the bottom and look through the top one to check the level.
To add oil - fold down the seat backrest. Remove the plastic trim - held on by 4 screws and 2 pop out plastic cllips. Undo the 8 large bolts that hold the cover in place - 2 on top and 3 on front and back.Then lift up the cover from the front edge. You will then be able to get to the resevoir - you will need a funnel to poor fluid in.