Between the "Y" or "H" pipe and the exhaust manifolds. One on each side of the engine with two converters in each pipe. If you crawl under the car, they should be on either side of the transmission. They will look like a smaller version of the muffler, but they will have heat shields welded around the actual converter.
There are two catalytic converters on the 1998 ford explorer.
On a 1998 Mercury Grand Marquis : Bank 1 is the passenger side of the engine Sensor 2 is AFTER the exhaust has passed through the catalytic converter
2
Two.
what is a fire order for 1998 mercury grand marquis
Yes
Look under the vehicle and count them.
There are two catalytic convertors on this model.
On a 1998 Mercury Grand Marquis : Bank 2 is the drivers side of the engine Sensor 1 would be in the exhaust close to the engine before the exhaust enters the catalytic converter ( upstream sensor )
You can but the check engine light will remain on and it won't pass an emissions test.
According to the 1998 Mercury Grand Marquis Owner Guide : ( 71.9 litres / 19.0 U.S. gallons )
4. Two in the front, two in the back.