HiI!!
6 cyl. and 8 cyl. engines are divided into 2 Banks, standing in front of the Engine, the Bank 1 is the side where the #1 spark plug is (on V6 Ford Engines is on the PASSENGER SIDE). Bank 2 is on the DRIVERS SIDE.
Check the following diagram for HO2 sensor locations (This diagram applies to Ranger, Explorer and Mountaineer models) :
2 would be Bank 1 and 2A would be Bank 2.
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SOURCE: 2002 Pontac Grand Prix GTP P0171 code engine stumbling at times
Bank 1 is the frt side exhaust manifold (did they say bank 1 sensor 1?),you can start by replacing that sensor,i would check the intake for leaks ,the gm 6cly. are known for bad intake gaskets,you will see oil coming out form the frt or rear of the intake,also check your atifreeze overflow bottle for bronwish sludge,which means that the oil is mixing with the antifreeze.A leaking intake could cause that lean condition.
SOURCE: more 99 cougar problems
there is a fuse for the o2 heaters if one of the sensors blew the fuse they will all be out
SOURCE: o2 sensor bank 2 sensor 2
Bank 2 will the the passenger side or right side and sensor 2 is the O2 sensor behind the catalytic converter.
SOURCE: o2 sensor location
DTC P0156 indicates the output voltage of the downstream Heated Oxygen Sensor (HO2S) is less than some calibratable functional window.
The possible causes are:
Since you didnt specify the engine size in your vehicle - please see the diagram below for the location of the sensor(s)
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SOURCE: Getting PO141 trouble code when scanning! Car '03 accord, 2.4 ltr
http://www.honda-tech.com/showthread.php?t=2385730 good luck!
Testimonial: "Thanks! I figured out po141 is the sensor that goes into the cat after studying few books and trial and error. Part store gave me the wrong info 1st. "
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