General method description: Fault-tracing
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
The source of a leak can be located by analyzing sound at the following points.
| Exhaust pipe | Faulty exhaust valve |
| Intake manifold/throttle body (TB) | Faulty intake valve |
| Dip stick hole/Crankcase ventilation | Faulty piston/piston ring |
| Adjacent cylinder | Faulty cylinder head gasket |
| Radiator | Faulty cylinder head gasket/cracked cylinder wall. Also check for bubbles in the expansion tank. |
A mechanic's stethoscope or a rubber hose can be used as a listening device.
NOTE:
There is leakage at the piston rings even on a perfect engine. This is the only place where a small leak is permissible.