O2 sensor 2003 lincoln navigator bank 1 and 2

"O2 Sensor Circuit Slow Response Bank 1 Sensor 1"
Just change the one in Bank 1, why change good sensors.
"O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 1"
Probably just an air leak.
NEVER use aftermarket or remanufactured spares, they are not always compatible.

The O2 sensor code could be the answer. If the sensor is faulty it could be causing the fuel mixture to be too lean.

there is nothing wrong with the timing chain position . Just a series of sensors that have gone outside the set parameters so if you check and change each one you will clear the faults.

Check it for codes

You most likely have a couple bad COP Ignition Coils,
possibly a bad EGR Valve or TPS Sensor

All those are common ford & lincoln items

Change the oxygen sensors just before the exhaust converters
if you have 100,000 miles on it

Replace the Gas & Air Filter & clean MAF Sensor with CRC MAF
Cleaner

Install New Spark Plugs

All I suggested should have beeb done when you got it

All your vehicles as well---It is called Preventative Maintenance

P1131 Lack of HO2S-11 Switch ,Sensor Lean
P1151-Lack of HO2S-21 Switch ,Sensor Lean
PO171- System to Lean (Bank 1)
PO174-Systen to Lean (Bank 2)

Fuel Filter -Plugged
Low Fuel Pressure
Evap System -Leaks
Leaks - in ducting,air filter to throttle
PCV -Leaks
Exhaust System -Leaks
O2 Sensors-worn out

O2 sensors are always in the exhaust of the engine. it measures the exhaust gas to help regulate fuel delivery. the lincoln probably has two banks of sensors. one on each side of the motor located close to the engine in the exhaust pipes. looks a little like a spark plug sticking out of the pipe and will have an electrical line going less than a foot to a connector. there can also be one after the catalytic convertor. same look there too. hope this helps and good luck

It means you need to replace your O2 sensor, bank 1. You can buy a new sensor at any auto parts store, usually around $20. The bank 1 means it is the first O2 sensor in the system. To find it, start at you exhaust manifod, and search back along the piping. The first O2 sensor you find is the one that is failing. A wrench or socket can be used to removed the old and install the new.

Good Luck!!

bank 1 is pass/side exhaustpipe/converter bank 2 is on the driverside,this car has two converters, so you have 4 oxygen sensors, one before and one after the converter on each side, so bank 1 sensor1 is pass/side before the converter, bank 1 sensor 2 is pass/side after the converter, then bank 2 sensor1 is driverside before the converter, before means starting at motor, then bank 2 sensor 2 is driverside after the converter, heres a diagram to help, i hope this is helpful.

Replaced a camshaft sensor still running rough & engine light still on, 2004 lincoln nav. 5.4 liter

Has the Maf sensor been chk'd? It controls the fuel. If the engine doesn't run proper, the transmission will act up. The maf sensor is located as the first sensor coming out of the air clraner. Inexpensive, easy replace fix. Good luck