I was told that my 98 s70 volvo has a emmissions leak what does this means?

Hi I am Vortash.. it could mean that somewhere on your exhaust system there is a leak basicaly and that this leak is throwing your c02 readings out . Now it could be your Catalytic converter or it may be your o2 sensor it may even be your manifold gasket , best thing to do is a general tighten up of all clamps and , check around the maniold for signs of blowing ( black sooty deposits ) if you find them replace the manifold gasket .. check the o2 sensor and have the readings done again if they are the same then your probably looking at replacing the Cat , regards Vortash

Could be one or more of the following:

• The Air Induction System (air ducts, intake manifold, etc.);
• The Fuel Metering System (carburetor if so equipped, fuel injectors if not, etc.)
• Ignition System (spark plugs, etc.)
• Exhaust Gas Recirculation System - EGR (speed sensors, etc.)
• Positive Crankcase Ventilation System - PCV (PCV valve, oil filter cap, etc.)
• Fuel Evaporative Control System - EVAP (fuel tank, fuel lines, gas caps, etc.)
• Secondary Air Injection System (temperature sensors, etc.)
• Exhaust System (catalytic converters, exhaust manifold, etc.)
• Engine Emission Control System Sensors (oxygen sensors, air conditioner sensors, etc.)
• On-Board Diagnostics - OBD (service reminder system, etc.)
• Related Parts (hoses, switches, gaskets, etc.)

It means that if u have a catalytic converter then ur catalytic converter which reduce the emissions is not working in proper manner which it means that it is broken