SOURCE: 2001 volvo s40 trouble code P0015
This is a common issue particularly with vehicles that have had some neglect to the oil change routine. The VVT solenoid on the top of the valve cover gets clogged with thickened or sludged oil.
Replace the VVT solenoid and gasket with a new unit and clear the codes.
SOURCE: Volvo S40: P0014 - Exhaust Camshaft Position - Timing Over-Advanced (Bank 1)
Here's a link to your code.
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