Welcome
. Yes, 2 Precatalytic Converters which are part of the exhaust manifolds (hence the high price) and one main catalytic ocnverter. At 11 years and 110K miles, there is a good chance that all 3 are broken. Do the el cheapo plugged exhaust test to determine which is plugged. If you do not have to deal with smog inspections, you may want to consider gutting the plugged converter and leaving the other two alone.
El Cheapo 1995 Duratec Plugged Exhaust Test.
For the Duratec, a good cheap way is to remove the O2 sensors, in this order (and see if the performance improves). Uninstall Bank 2 upper (radiator side) to determine if Bank 2 precat is plugged, reinstall Bank 2 upper and then uninstall Bank 1 upper (closest to firewall) to determine if bank 1 precat is plugged. Battery needs to be disconnected before uninstalling and installing O2 sensors. Make sure that where the O2 sensor openings are do not have tubes or wires which can melt easily as the exhaust is very hot. If there are, need to cover them or have something to divert the exhaust gases away from them. And do not drive for more than a few minutes.
Bank 1 Upper O2 sensor replacement in
Duratec Maintenance FAQ
Bank 2 (radiator side) Upper O2 sensor; Need a O2 sensor removal tool, 7/8 inch or 22 mm crescent wrench.
On this 2-Dimensional picture, ignore the red box and arrow, the Bank 2 Upper is the sensor on the left of the pre-cat (closest to the oil filter). The arrow is pointing to the Bank 2 pre-cat. Also ignore the Bank 2 Lower (the O2 sensor on the right of this picture) as the 1995 models do not have lower o2 sensors.
Originally posted by chongo: