Did you replace the right one ? This code does not necessarily mean the O2 sensor is bad . The code description say O2 heater " CIRCUIT " bank 1 sensor 2 Did you check the wiring , the fuse ?
P0141 - O2 Heater Circuit (Bank 1, Sensor 2)
Description:
See the description for DTC P0135.
Possible Causes:
See the possible causes for DTC P0135.
Diagnostic Aids:
See the diagnostic aids for DTC P0135.
Application
Key On Engine Off
Key On Engine Running
Continuous Memory
All
GO to Pinpoint Test DW .
P0135 - O2 Heater Circuit (Bank 1, Sensor 1)
Description:
During testing the heated oxygen sensor (HO2S) heaters are checked for open and short circuits and excessive current draw. The test fails when the current draw exceeds a calibrated limit or an open or short circuit is detected.
Possible Causes:
Diagnostic Aids:
Check the HO2S electrical connector for damage, corrosion, and water intrusion.
Damaged HO2S heater.
Application
Key On Engine Off
Key On Engine Running
Continuous Memory
All
GO to Pinpoint Test DW .
SOURCE: Ford Windstar 1996 Trouble Codes P0171, P0141, P0161, and P0174
Bank one is toward the front of the vehicle. Sounds like the heated oxygen sensors have gone bad. The Oxygen Sensors are located in the exhaust pipe and require a special socket to remove and replace.
SOURCE: Mass Air Flow Sensor, oxygen sensor and coil plugs
I have codes 172 & 175 (Fuel trim bank 1 & 2, running to rich) So I was told to replace the Mass Air Flow Sensor. Easy install but very expensive ($150). We'll see if the service engine light comes back on.
SOURCE: 2001 ford e-250 4.2 engine engine idle surges
Listen before you spend the money try a simple thing first. At our shop we start with the EGR solenoid, locate it, remove it, make sure that the ports are clear. Carbon build can cause your symptoms
SOURCE: 2006 Ford Fusion a/c not working
its inside the hvac box under the dash you may or may not have to romove the hvac unit to change it. circuit high means an open circuit so check connectors and such
Here is the daignostic procedure for troubleshooting DTC P0141 (click over each image for zoom)...
Hope this helps to solve it.
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