O2 sensors part # question.

[LincolnJosh]

I recently attained a 2001 Lincoln Town Car signature in good condition.

Found that I need to replace the O2 sensors, I’d like to do Motorcraft.

I’ve read the downstream sensor is DY-1401 which I’ve already replaced, but now I’m getting a p0153 code for the upstream sensor on the same bank (Driver's side or bank 2). I thought I resolved it the other day because the maf was dirty and the baffle on the intake tube between the maf and TB were just loosely in there. After the cleaning and fixing the air leak, the code went away but came back after trying to get the CAT monitor reading for emissions inspection.

Anyways, I get conflicting info on what the upstream sensor part number is. Local ford dealership only shows DY-1401 for my vin, but I've read the sensors are different.

Is it accurate they’ve all be updated to that same sensor? If not can anyone help supply the motorcraft part number?

 

[oktowncar]

Looking online at a ford parts site it shows:
Ford F1SZ-9F472-B Sensor ( Front )

 

[G-159140]

@oktowncar Thanks, I see that on ford parts giant, which isn't a ford dealership, but it also gives an updated part number of GU2Z-9G444-A.

And for anyone else wondering that gives a replaces others list:

1R3Z-9G444-AA, 1R3Z-9G444-BA, 5C5Z-9F472-AA, 5C5Z-9F472-BA, 5F9Z-9G444-BA, 5W6Z-9G444-AA, 5W6Z-9G444-BA, 6E5Z-9G444-AA, 6L7Z-9F472-BA, F1SZ-9F472-A, F1SZ-9F472-B, F1TZ-9F472-A, F3UZ-9F472-A, F4DZ-9F472-A, F4DZ-9F472-B, F4SZ-9F472-A, F4SZ-9F472-D, F4UZ-9F472-A, F4ZZ-9F472-C, F5AZ-9G444-B, F5MZ-9F472-AA, F5UZ-9F472-A, F5WZ-9F472-BA, F6DZ-9G444-AA, F6DZ-9G444-B, F6DZ-9G444-EA, F75Z-9G444-AA, F75Z-9G444-BA, F77Z-9F472-BA, F78Z-9F472-AA, F78Z-9F472-BA, F7RZ-9G444-BA, F85Z-9G444-AA, F85Z-9G444-AB, F85Z-9G444-E, F88Z-9F472-AA, F88Z-9F472-AB, F88Z-9F472-BA, F8RZ-9G444-BB, FOTZ-9F472-A, XC2Z-9F472-AA, XC2Z-9F472-BA, XR3Z-9G444-BB, XR3Z-9G444-EA, XR3Z-9G444-HA, XR3Z-9G444-JA, DY-1005, DY-1034, DY-1038, DY-1039, DY-1040, DY-1053, DY-1057, DY-1058, DY-1060, DY-1063, DY-1081, DY-1086, DY-1087, DY-1089, DY-1091, DY-1093, DY-1104, DY-649, DY-661, DY-703, DY-731, DY-761, DY-800, DY-831, DY-832

 

[LincolnJosh]

@oktowncar Thank for that. Though I see that number on fordpartsgiant, not an actual ford parts online store. In any case F1SZ-9F472-B is correct, it's also superseded by GU2Z-9G444-A.

GU2Z-9G444-A also supersedes the following part numbers:
1R3Z-9G444-AA, 1R3Z-9G444-BA, 5C5Z-9F472-AA, 5C5Z-9F472-BA, 5F9Z-9G444-BA, 5W6Z-9G444-AA, 5W6Z-9G444-BA, 6E5Z-9G444-AA, 6L7Z-9F472-BA, F1SZ-9F472-A, F1SZ-9F472-B, F1TZ-9F472-A, F3UZ-9F472-A, F4DZ-9F472-A, F4DZ-9F472-B, F4SZ-9F472-A, F4SZ-9F472-D, F4UZ-9F472-A, F4ZZ-9F472-C, F5AZ-9G444-B, F5MZ-9F472-AA, F5UZ-9F472-A, F5WZ-9F472-BA, F6DZ-9G444-AA, F6DZ-9G444-B, F6DZ-9G444-EA, F75Z-9G444-AA, F75Z-9G444-BA, F77Z-9F472-BA, F78Z-9F472-AA, F78Z-9F472-BA, F7RZ-9G444-BA, F85Z-9G444-AA, F85Z-9G444-AB, F85Z-9G444-E, F88Z-9F472-AA, F88Z-9F472-AB, F88Z-9F472-BA, F8RZ-9G444-BB, FOTZ-9F472-A, XC2Z-9F472-AA, XC2Z-9F472-BA, XR3Z-9G444-BB, XR3Z-9G444-EA, XR3Z-9G444-HA, XR3Z-9G444-JA, DY-1005, DY-1034, DY-1038, DY-1039, DY-1040, DY-1053, DY-1057, DY-1058, DY-1060, DY-1063, DY-1081, DY-1086, DY-1087, DY-1089, DY-1091, DY-1093, DY-1104, DY-649, DY-661, DY-703, DY-731, DY-761, DY-800, DY-831, DY-832

Edit: Now if I cross reference GU2Z-9G444-A on a ford run online part site it comes up with this one but also notes "Other names" which show the following list: Oxygen Sensor, Lower Oxygen Sensor, Upper Oxygen Sensor, Rear Oxygen Sensor, Ft Oxygen Sensor, Sensor Exhaust Gas Oxygen, and DY-1401 part number.

DY-1401 is just what I put on the downstream side so perhaps DY-1401/GU2Z-9G444-A is the same.