Fixing a leak depends on where the leak is and the severity. An exhaust connection could be loose or a gasket is bad. If there is a hole in a pipe there is a possibility that the hole can be welded, taking care to stay away from fuel lines or anything flammable.
replace the carbon canister
The Ford Explorer may have an exhaust leak. An exhaust leak is loud and will lead to sluggish acceleration as well as a loud raspy sounding vehicle.
check camshaft sychronizer
Probably have a leak in the heater core>
Usually this is a vacuum leak. Can also be a leak in the exhaust system.
A vacuum leak on a 1999 Ford Ranger can be located using an automotive stethoscope. It can then be move around the engine to detect the sucking noise of a leak.
Possible exhaust leak
A vacum leak is suspect here. Trace your vacum hoses from your pcv valve (located on the valve cover) back and check for a vacum leak
CHECK FOR VACUUM LEAK! MOST LIKELY YOUR PCV VALVE COME LOOSE WHICH ATTACHES TO ABOUT A 1/2 IN. DIAMETER HOSE CONNECTED TO INTAKE!
Leak in exhaust system?
It depends on where it is leaking. If it is the lines it is cheap. Anything else it is not.
That's not telling us much ! - It depends WHERE exactly it leaks from .