It's ingesting raw unburnt fuel or the converter is partially clogged and needs replacing.
They are under the car, just after the engine exhaust manifold.
Bank 1 is the passenger side of the engine on your Ford Crown Victoria Sensor 1 would be in the exhaust close to the engine before the exhaust enters the catalytic converter
Bank 2 is the drivers side of the engine on your Crown Victoria Sensor 1 is in the exhaust before it enters the catalytic converter ( upstream )
On a Ford Crown Victoria : Bank 2 is the drivers side of the engine Sensor 1 would be close to the engine BEFORE the exhaust enters the catalytic converter
Bank 2 is the drivers side of the engine in your Ford Crown Victoria Sensor 2 would be in the exhaust after the catalytic converter ( downstream )
Bank 1 is the passenger side of the engine Sensor 1 is in the exhaust before the exhaust passes through the catalytic converter
On a 2002 Ford Crown Victoria : Bank 2 is the drivers side of the engine Sensor 2 ( downstream sensor ) would be in the exhaust after the catalytic converter
Gets clogged
carries these old parts 1A Auto.com
how many catalytic convertors does a 1997 Ford Crown Victoria 8 cylinder car have?
Faulty spark plug or wireFaulty coil (pack)Faulty oxygen sensor(s)Faulty fuel injectorBurned exhaust valveFaulty catalytic converter(s)Running out of fuelPoor compressionDefective computer
Bad fuel pump? Plugged fuel, air filter? Plugged catalytic converter?