I have a 1996 Ford Windstar, 128k miles, 3.8 engine. I am getting a total of 4 codes as follows: No. 1 - P0171 (freeze frame), System to Lean, Bank 1; No. 2- P0141, 02 Heater Circuit, Bank 1, Sensor 2; No. 3- P0161, 02 Heater Circuit, Bank 2, Sensor 2; and No. 4 - P0174, System to Lean. Could these 4 codes all be related to the same problem? If so, what could the possible solutions be? Also, where is the Bank 1, Sensor 2 and the Bank 2, Sensor 2 Oxygen Sensors located? Also, which set of cylinders is the Bank 1 set? Thanks
Mass Air Flow sensor. All four o2 sensor are not going to fail at once.
I went through this for weeks trying to figure it out. I had just replaced the MAF sensor about 8 months prior, so I thought it must be something else. After throwing new intake gaskets and o2 sensors and fuel pressure tests and compression tests and smoking the intake, I discovered that the MAF sensor had failed. Truck runs great to this day. BTW, NEVER EVER use MAF sensor cleaner from an aerosol can on a MAF sensor, and o2 sensors do not need to be cleaned, they live in soot every day and they like it that way. They usually outlive the vehicle except in cases of over-adding STP type cleaners and using bad gas. They should only be removed when your catalytic converters finally burn out. (My opinion)
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.
System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
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Thanks.
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Thanks for the info. So, there must be four oxygen sensors on the vehicle. One up front on Bank 1 and 1 up front on bank 2. Then there is one on the catalytic converter and 1 (i.e., Sensor 2) on the exhaust pipe which is to the right (passenger side) of the catalytic converter. I have two more question if you will. First, what designation, number is assigned to the two oxygen sensors up front. Also, I thought all the exhaust fumes had to go thru the catalytic converter. That being the case how come the exhaust pipe with sensor 2 on appears to be bypassing the catalytic converter as it runs adjacent to the catalytic converter. Thanks
p0141 blank 1 sensor 2 emissions will not p ***
finding location of banks one and two in exhaust system
where is the sensor located
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