2000 Lincoln Navigator Error Code P0161
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2000 Lincoln Navigator Error Code P0161
Hello everyone, I recently received check engine light on my navi. Took the car to the mechanic he ran a diagnostic and told me it was error code P0161 and that Sensor 2 in Bank 2 (behind the cat) needed to be replaced. I replaced the Sensor my self and after a couple of minutes driving the light came back on. I had disconneted the battery while i was working on the car. Took the just recently replaced Sensor off and exchanged it for another one from autozone thought it might have been a faulty sensor but I got the same problem with the new sensor. I've triple checked everything and still I have this problem. Any help would be greatly appreciated. Thanks in advance.
Logistics Pro
Joined: Jan 2001
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From: Central NYS
Your mechanic probably mis-read the description of the P0161. By setting the P0161 DTC the PCM is telling you that there is a circuit malfunction in the heater circuit of the HO2S-Bank 2 -Sensor 2.
When the PCM runs the O2 Sensor Heater Monitor, it also checks opens, shorts, and excessive current draw in the heater circuit. It could be a dmaaged heater in the O2 sensor, but since you already tried another sensor and got the same results, the problem is gonna be in the wiring harness or a connector.
You might be looking for a corroded or damaged connector, an open in the VPWR side, a poor ground in the heater ground, or the ground side shorted to VPWR. I can't remeber if there is a fuse that protects the heater circuits. If there is, it may have blown.
Hopefully someone will be along shortly that will know.....
When the PCM runs the O2 Sensor Heater Monitor, it also checks opens, shorts, and excessive current draw in the heater circuit. It could be a dmaaged heater in the O2 sensor, but since you already tried another sensor and got the same results, the problem is gonna be in the wiring harness or a connector.
You might be looking for a corroded or damaged connector, an open in the VPWR side, a poor ground in the heater ground, or the ground side shorted to VPWR. I can't remeber if there is a fuse that protects the heater circuits. If there is, it may have blown.
Hopefully someone will be along shortly that will know.....
Hotshot
Joined: Jan 2004
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From: St Louis
Adding to Jim's comments:
Verify you replaced the CORRECT sensor. O2S22 is the downstream (closest to the exhaust tailpipe) on the passenger side.
A common problem with these trucks is that the O2 sensor harness gets onto the exhaust or, if a 4x4, onto the front axle half-shaft. Depending on the nature of the failure and which wire(s) get damaged/shorted/opened, you can get either a sensor-specific DTC or you'll blow the fuse (F23) that supplies heater power. However, if f23 blows, the truck dies since that same fuse is critical for engine operation.
If you did replace the correct sensor, inspect the harness to the indicated sensor.
There is a step-by-step diagnostic procedure in the PCED, if needed, that runs a tech through the wiring to isolate the fault.
Verify you replaced the CORRECT sensor. O2S22 is the downstream (closest to the exhaust tailpipe) on the passenger side.
A common problem with these trucks is that the O2 sensor harness gets onto the exhaust or, if a 4x4, onto the front axle half-shaft. Depending on the nature of the failure and which wire(s) get damaged/shorted/opened, you can get either a sensor-specific DTC or you'll blow the fuse (F23) that supplies heater power. However, if f23 blows, the truck dies since that same fuse is critical for engine operation.
If you did replace the correct sensor, inspect the harness to the indicated sensor.
There is a step-by-step diagnostic procedure in the PCED, if needed, that runs a tech through the wiring to isolate the fault.
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I actually took it to another mechanic friend of mine and he told me to take the Autozone Bosch sensor off and return it and pick up a motorcraft one from the dealer. As I took off the sensor on Saturday I checked the wire harness for bank 2 sensor 2 with a fuse tester and it is getting power. I'm picking up a new sensor from the dealer today and hopefully that works.
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