Computer getting signal from oxygen sensor that bank 1 is running too lean.
System has reached the limits of it's fuel enrichment capabilities.
Many possible reasons; vacuum leaks, defective or coated sensor, etc.
Easily searched: p codes Lincoln
Trouble code P0420 means:Catalyst system efficiency below threshold
No. I recently had my key break off in the ignition in a 2004 Kia Sedona. I had a locksmith remove it and make replacement keys that he was afraid might be coded because of the large size but after making 2 new spares, we discovered they were not coded which would have caused the engine to shut down after a few seconds. I can;t speak for all model years but in 2004 they were not coded. I Have A 2004 Kia Sedona The Key Code Is Y7401
The 2004 Lincoln Navigator has 32 valves.
The 2004 Lincoln Navigator has a V8 engine.
Trouble code P2107 means: Throttle Actuator Control Module Processor Trouble code P2110 means: Throttle Actuator Control Motor Processor also means: throttle position sensor
The 2004 Lincoln Navigator has a 4-speed automatic.
The 2004 Lincoln Navigator is a gas-powered vehicle.
The fuse that controls the 12V outlets in the front of a 2004 Beetle will be coded with a title that resembles the words, cigarette lighter. They might also be coded as 12v outlet.
The Trouble with Sweeney ended in 2004.
The curb weight of the 2004 Lincoln Navigator is 5822 lbs..
The 2004 Lincoln Navigator is 17 ft. 2 in. (206 in.) long.
The height of the 2004 Lincoln Navigator is 6 ft. 5.8 in. (77.8 in.).