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Re: Where would the 02 sensores for a 1997 ford crown...
The two pre-cat sensors are the exhaust pipe(s) just after the manifolds, the two downstream sensors are between the first and second cat(s) on the H-pipe.
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O2 sensors are located in the exhaust system, before and after the catalytic converter, (Cat).
Sensor 1, (Upstream sensor), is before the catalytic converter, often positioned in the exhaust manifold or in the down pipe attached to the manifold.
Sensor 2, (Downstream sensor), is positioned under the vehicle after the catalytic converter. They usually stick out at 90 degrees to the exhaust and can be a real pain in the tailbone to get out.
It's in the center, rear engine area, mounted in the exhaust manifold. Kind of a pain to get at, but doable. It's easier if you take the oil filter off.
There is no ignition module. The ignition coils are controlled directly by the Powertrain control module (computer) located inside the vehicle above the drivers left foot and connected to the engine wiring harness thru the firewall
Ford contour has 4 O2 sensors, one under the coil pack between the engine and firewall (bank 1, sensor 1 and it's a pain to reach), one in front between the radiator and engine and two accessible from underneath.
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