SOURCE: Volvo S40 OBD II P0171 & P0237
for p0171 it could be a few things like intake/exhaust leak,air system,map/vaf sensor,fuel presure/pump,injector(s),ho2s(heated oxygen sensor.
SOURCE: check engine light 97 ford explorer. obd-II po141
Looked up your OBD II code for your Explorer and got the following: Bank 1 Sensor 1
The possible causes are listed below per Chilton: *same result for all engines available on your vehicle
Trouble Code: P0141 (4.0L V6 VIN E Auto)
HO2S-11 Heater Circuit (Bank 1, Sensor 1)
Print this code data
Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
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:
The sensors themselves appear in the illustration linked to below. The illustration is for the Ford Ranger but indications are that other models have similar locations. Hope this helps with your problem. Best of luck!
Greg
http://www.chiltonlibrary.com/content/images/8968/images/89684g23.pdf
SOURCE: 1997 mazda 626 Over Drive off light flashes and
OBDll 1744 says torque pressure control system mechanically stuck in off position.
SOURCE: Check engine light obd II code P2A00. Where is the
there are two sensors one before the catalyst and one after,follow thw exhaust system from the side of the head and the first sensor you meet is sensor one which relate's to your fault
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