Question about Lincoln Navigator

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I have a 2003 lincoln navigator 4wd. I was getting a code reading that bank1 and bank2 for oxygen sensor's was bad. I replaced both oxygen sensor's closet to the engine 1 on the left side and 1 on the right of the vehicle and reset computer. My vehicle runs ok until it gets warm and then it starts hesitating as i slow down, and once the vehicle stops, it will hesitate and eventually shut off. pleeae help me

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I hope you didn't change the O2 Sensors based on a code.
OBD2 Systems don't work that way. The codes only point to an area of the powertrain with an issue. I also hope you tested the sensors first, otherwise you were installing parts, that were most likely okey.

Is the Air Filter clean?
Have you cleaned the MAF Sensor ---CRC MAF Cleaner?
Have you cleaned the Throttle Plate---CRC Throttle Body Cleaner?
How old are the spark plugs---More than three years or 50,000,get rid of them?
Are there ANY Leaks in the ducting to throttle or any hoses leaking---most common cause of O2 Sensor out of range and code set (MIL Lamp On)
Do you have PO300 Codes?---COP Coils Missing,All Fords have one or a year go bad.
If you have the original EGR Valve--throw that away,and get new one. Should have failed before now.
Coolant Temp Sensor ! Not working correctly would keep taking it out of closed loop and affect O2 Senors
TPS Sensor--worn and be your only issues. Two Torx screws to remove and avail on line or parts store ( do yourself) ONLY after testing and only if tests bad

Posted on Sep 29, 2010

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1 Answer

Code number for o2 sensor voltage low


Forget to write it down?

Generic or Manufacturer?

There are 41 Generic O2 Codes

PO 131--bank 1 sensor 1
PO 137--bank1 sensor 2
PO 143--bank1 sensor 3
PO 151--bank2 sensor 1
PO 157--bank1 sensor2
PO 163--bank2 sensor 3

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2003 lincoln ls what does the codes 420 and 430 mean


PO420--Catalyst System Efficiency Below Threshold (Bank1)
PO430-- " " " " " (Bank2)


O2 Sensor
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Thermostat
Etc

Owning a 2004 V8 myself--I will say your need to go thru the entire engine, as to how it is running
It may be overheating due to coil misfires or other issues and ruined the
converter

You need to solve all issues before replacing a converter
I would stay far away from a dealer, unless you have a couple thousand to spend

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1 Answer

How do I change the oxygen sensor


Locate the faulty oxygen sensor in the exhaust system, disconnect the electrical connection, and then you will either need the correct size box wrench or oxygen sensor socket(available at most part stores) to remove the sensor. I recommend either warming up the exhaust system a bit and being careful not to get burned or using liquid wrench to help loosen it up. Installation is the reverse. Just make sure you remove the correct sensor, these new vehicles often use more than one oxygen sensor.(bank1 is driver's side, bank2 is passenger's side, sensor1 is before the catalytic converter, and sensor2 is after the catalytic converter)

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1 Answer

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There are 4 oxy. sensors listed for your truck. they're located as follows
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conv. bank2 sensor2. Hope this helps.

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2 Answers

I have replaced my bank one sensor one twice now


It is possible that there could be a leak in the intake on bank one providing a high oxygen reading for that bank. Since this would be unmetered air, (not flowing through the mass airflow sensor) the computer would not trust the reading from the sensor because it could not compensate for it. Possible leaking intake gasket bank one.

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Hello..
Code 21: Is an oxygen sensor Code 54: Is a crank positioning sensor.
Hope this helps!

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1 Answer

Where is bank 2 for oxygen sensor


if it is a 6 cylinder it is in the front of the motor next to the radiator. bank2 sensor 1. back side of motor next to the fire wall is bank1 sensor 1. the one behind the cat is bank1 sensor 2. make sure that is the problem. if code p0420 is the cat or cat's are bad.

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1 Answer

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Bank 1 is the same side as cylinder #1 and bank 2 is the same side as cylinder #2. Good luck and hope this helps.

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