The engine may not start due to a failed starter control module. If the module has indeed failed, it will require replacement.
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Repairpal verified Volvo S40 problems
There have been reports of premature rear brake pad wear. Our technicians recommend to inspect brake pads at each tire rotation interval.
The turbocharger return pipe seal may develop an oil leak. The leak can begin very small, but will eventually progress into a large leak. Our technicians recommend having this repaired at first signs of leakage.
The fuel pressure regulator can leak and cause a hard start condition, without any faults recorded in the engine computer.
The right front engine mount wears out prematurely, causing engine vibration at idle.