Don't drive your car!
If by 'loud' you mean there's knocks and rumbles - that sounds like serious damage caused by zero or low oil pressure. If there's no terminal damage yet caused by a lack of oil pressure .. there soon will be.
Don't drive your car. Get somebody qualified to have a look at it first. Your oil pressure warning light is on because there's no oil pressure. You're liable to destroy the engine (very quickly) if you run it with no oil pressure.
The first thing you should do is check your engine oil level. Make sure that the oil level reaches 'full' on the dipstick.
If your oil level has been unacceptably low - top up and start the engine. The oil warning light should go out within a couple of seconds. If not - it points at a problem elsewhere. Don't run your engine with the oil light on. Get a second opinion.
SOURCE: volvo v40 T4
you hose inside the fuel tank might be crack or it might have a hole i recomend you to inspec the hoses inside the fuel tank or make sure the sending unit inside the thank is working propelly
because sometimes the sending unit wich is the sensor for fuel level will read fuel at fuel gage when there is not fuel in the thank i seem this many times even experienced mechanics had replace fuel pump and then they find that there is not fuel in the tank
SOURCE: volvo v40 stalling when idling
If the car shakes and stalls at lights stop signs etc. I would check the egr ( exhaust recirculator valve) first this valve should open when in driving mode and close immediately when engine comes back to idle. to check this find the valve on the intake manifold ( looks like a mushroom) remove vaccuum line and plug hose drive the car and see if it fixes the problem. If it does get one from local parts store. Most brands such as standard are universal and come with baffles that must be installed. do not leave the valve disconnected the engine will "ping" when driving forcing you to buy higher octane gas. It is also illegal to remove this unit for emission reasons.
SOURCE: 1997 volvo 850 abs light and trac light on
you will have to have the car diagnosed with a code reader most garages have them prices from £20-90 to diagnose the fault + parts.
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