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Volvo S40 Questions

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Thinking of buying a 2002 Volvo 40s but he dashboard does not work. No gauges or lights work on the dash. Could this be a major problem or just a fuse?
What exactly is that code
I checked the spark plugs they were very dirty I replaced um an replaced my coils as well still no start I well did a full oil change an there was no milky substance so I'm thinking my head gasket is fine.
Car runs awesome not a hiccup with 200000miles taken to dealer for all services. But smog tec tells me it's not worth fixing n I need to sell it,n check engine light was disabled somehow? I reset codes n only came up with code 420, Can't believe car is not worth fixing! Runs awesome super clean...
I've switched the relay 3 times the hazard switch twice still nothing could the cem have something to do with this and if so can I use one from the salvage yard and how are they removed
What could be the problem
I have a 2000 Volvo s40 and it starts and turns off if my foot is not on the gas I was told I need a tune up and spark plugs. Is that true my check enigine light is on
Slight sound at idle as well. Drives fine, shifts fine but sound does not stop. Smells oily. Three times engine cut out like was not getting gas but has not happened for quite some time. Had oil changed and fluids checked....said transmission fluid was very dark. No codes showing on messages
The car has sat up for about 2 years before I bought it and I had to replace the timing belt bracket but it still runs rough when first started and has trouble getting up to speed when I take off or slow down
First the car started cutting off. then the knocking noise began
stop working as well as the automatic door locks
I replaced radiator myself and did not measure how much fluid I lost when trans. hoses were disconnected.
Been noticing a rattling noise the car is idling in park it's fine
Shift into reverse it rattles for a second
Neutral is fine
Drive it rattles 3 times
And when accelerating past 20 or 30 it rattles for a second as well feels like it's on the left.

Joints maybe or mounts my drive in Houston always has a ton of bumps and it rattles when I go over those as well.
01 s40
173k
Had battery tested and fully charged at autozone
Then figured it was that alternator
Had that and the serp belt replaced.
Ran fine for a week then I had the door open for maybe 10 mins (car off light on) and then it wouldn't start.
Jumped it and took a drive for 30 mins to see if it would charge up, and wouldn't start again.

Thinking there's a power drain from a light or something any clues on common issues or where to start looking?
Mechanic said there was corrosion but didn't tell specifics. What should I look out for and what areas would make it not worth purchasing the vehicle.
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