Replace the catalytic converter,it is defective and allowing exhaust gases to pass through it untreated.Run the oxygen sensor readings and you should see the rear sensor readings close to the front sensor readings which has then set the p0420.
SOURCE: coil replacement How?
I guess as you may know , it has indidvidual coil packs for each cylinder. The ones on the driverside, 4,5, and 6 are easy to change. just unscrew the bolt holding the coil pack down on the plug and pull it off and unplug the coil pack from the locking plug by squeezing near the back where the wire goes in the plug. The ones on the passenger side require removing the intake manifold to get to them. This is not as hard as it may seem but the wires and a bracket connected in the back of the manifold do need to be disconnected in order to free the manifold for access to the coil packs. Wasnt such a hard job but a bit of a challenge.
SOURCE: 2002 Lincoln LS V8, gear shift shows E, check transmission light
sounds like tranny computer is bad take it to a grage and have a computer put on it cost about $50.00 to do this
SOURCE: 1997 toyota camry check engine light on,code po440,po420,po441,
P0420 is catalyst system efficiency below threshold (bank 1)
P0440 is evaporative emission control system malfunction
P0441 is evaporative emission control system incorrect purge flow
SOURCE: 2004 Lincoln navigator misfire on cylinder 8 error code p318
Replace the coil pack once more. I went through 2 new ones on my f150 on one cylinder. One worked, the other didn't (both new off the shelf). Condensation build up in the boot caused mine to misfire. Anytime you replace a coil pack, squirt a little silicone grease inside. This will prevent condensation from hitting your plug. Fords are notorius for this problem, especially if you live in a humid area. Also, make sure and clear the codes after you make the repair.
SOURCE: where is the coil pack located on lincoln ls v8 7
Driver side valve cover
7mm socket to remove coil covers and coil
1 thru 4 pass side
5 thru 8 drivers side
Front to back
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