AGrayson84
Active Member
Hi everyone, I've had a few codes that have been plaguing my 2006 Navigator for a few years now. I followed the Ford PCED troubleshooting steps the best I could a few years back and found that some of steps didn't seem to make sense and had no clear definition as to what was wrong, so I simply went ahead and changed all 4 of the O2 sensors with new Bosche sensors, and changed the VVT actuators with new Motorcraft units. I cleared the DTC's, but the same DTCs returned, pertaining to the O2 sensor (Bank 2, Sensor 1) and one of the VVT sensors (I forget which one now). I ended up just buying another vehicle and parking the Navigator till I felt like messing with it again.
I went back out to the garage yesterday, pulled the Navigator in, and started diagnosing the following code for now:
P0059 FORD - HO2S Heater Resistance Bank 2 Sensor 1
Following the PCED troubleshooting steps, I found that the heater circuit on the front O2 sensor of Bank 2 (left/driver's side) had no continuity with ground on the battery terminal. The other tests in the same step had resistance of over 10k ohms, which is what the PCED steps were looking for when checking resistance between the heater circuit and battery ground, HO2S, VPWR, and SIGRTN. I then compared to checking resistance on the same circuits on Bank 1 (right/passenger's side) and found that the Bank 1 heater circuit did have over 10k ohms resistance with battery ground. So the PCED instructed me to repair short in the heater circuit of Bank 2.
I found the correct Bank 2 heater circuit at the PCM (I confirmed with my multimeter) and the snipped the heater circuit wire a few inches behind the PCM connector, and a few inches behind the O2 sensor harness. I temporarily ran a new wire between the PCM connector and the O2 harness, cleared the DTCs, took the car out for a drive, and P0059 came right back. I should have checked to see if I now had any resistance against ground like Bank 1 did, but the car was of course hot when I came back and now it's pouring down rain.
But does anyone have any insight what else I might be up against with this DTC? I have ForScan and a Bluetooth code reader, but not sure of anything I can do to confirm whether or not the PCM is sending out the proper signals as needed, or if there's anything else useful I can do with real-time data on this. Thanks everyone!
I went back out to the garage yesterday, pulled the Navigator in, and started diagnosing the following code for now:
P0059 FORD - HO2S Heater Resistance Bank 2 Sensor 1
Following the PCED troubleshooting steps, I found that the heater circuit on the front O2 sensor of Bank 2 (left/driver's side) had no continuity with ground on the battery terminal. The other tests in the same step had resistance of over 10k ohms, which is what the PCED steps were looking for when checking resistance between the heater circuit and battery ground, HO2S, VPWR, and SIGRTN. I then compared to checking resistance on the same circuits on Bank 1 (right/passenger's side) and found that the Bank 1 heater circuit did have over 10k ohms resistance with battery ground. So the PCED instructed me to repair short in the heater circuit of Bank 2.
I found the correct Bank 2 heater circuit at the PCM (I confirmed with my multimeter) and the snipped the heater circuit wire a few inches behind the PCM connector, and a few inches behind the O2 sensor harness. I temporarily ran a new wire between the PCM connector and the O2 harness, cleared the DTCs, took the car out for a drive, and P0059 came right back. I should have checked to see if I now had any resistance against ground like Bank 1 did, but the car was of course hot when I came back and now it's pouring down rain.
But does anyone have any insight what else I might be up against with this DTC? I have ForScan and a Bluetooth code reader, but not sure of anything I can do to confirm whether or not the PCM is sending out the proper signals as needed, or if there's anything else useful I can do with real-time data on this. Thanks everyone!
