SOURCE: i have error codes p0156 p0161
Check the wire harness near the top of the engine in the rear. They were good for rubbing through on the trans fill tube bracket. Judging by the code you have 4 sensors. you would be interested in the drivers side rear sensor.
SOURCE: I get a DTC P0133 code on my 1998 Ford Explorer V8
it may be a defective O2 sensor here is th difinition:
P0133 - Heated Oxygen Sensor (HO2S) Slow Response Bank 1 Sensor 1 , this is the sensor on the side of the engine that #1 cylinder is on, it is the sensor before the cat.
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: i have code 1538 on my check engine for 1998 ford windstar ,does
on the passenger side of the engine you will see 2 small metal rods at the top of the engine just below the intake manifold there are little white clips that hold the rods on these clips usually break and the rods come off
SOURCE: location of the bank 1 sensor 2 O2 sensor on a 2001 ford escape
B1 means the sensor is located on the same bank of the engine that has the #1 cylinder. B2 is located on the opposite bank.
S1 means the sensor is located BEFORE the catalytic converter
S2 means the sensor is located AFTER the catalytic converter
You didn't say which engine you have, so I've included the diagrams of both 4 cyl and 6 cyl so you can see the banks
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