20 Most Recent 2001 Volvo S40 - Page 5 Questions & Answers

Have you checked your cables? Sounds as though there is a continuity issue, a break in the circuit. And I know through my previous research that there have been problems with the cables on this model.

could be the fuel pump or oil pump.

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possible a earth strap corroided inside the casing, requires wiring diagram and checking all power and earth points and resistance through the wires to make sure that they are ok these cars suffe with the loom across the front of the subframe corroiding and this could be causing the problem

If the display says "Off" the radio is locked from incorrect code input.

You need to leave the key in the accessory position with the radio on (display reads 'Off') for about two hours.
After that it should ask for he code again. You have three tries before it locks again.
Some radios are different, but typically you use the knob to adjust the numbers, push the knob in to move to the next number

should be on card inside drivers side door frame by striker pin that shows gross vehicle weight etc...

Volvo Owner Manuals

bad fuel pump