How do i fix my PO171system tool lean(bank1) in my ford explorer 98 and where is located.

Check for correct fuel pressure.
If fuel pressure is low could be bad fuel filter, fuel regulator or pump.
If fuel pressure is correct could be bad MAF sensor, injectors, O2 sensor or vacuum leak on inlet manifold.

could still be a vacuum leak.

Click here to see.

Under the vehicle, driver side on the frame. Your going to need a fuel line disconnect tool to remove the fuel filter.

it should be on bank 1 exhaust pipe infront of cataletic converter under vechicle

Bank 1 = drivers side (IE: 02 sensor bank1 = driver O2 sensor pre cat. converter)

2.9L and 4.0L engines-Left side front of the engine, below the cylinder head in the engine block

OK. Since you have had so much trouble lets check the dealer for an updated software calibration for the PCM (power train control module). Once we're sure there is no "fix" here lets talk about "lean" engine conditions. Lean means one of two things are wrong with the air fuel mixture (ideally 14.7 parts air to 1 part fuel). 1. Too much air -or- 2. Not enough fuel. If you access to a scan tool we need to look at fuel trims. With the engine warm look at this data on the scan tool. You have a "bank 1" and "bank 2" fuel trim data. Additionally, each bank has a long term and a short term value. With the Engine hot and at idle add the LT and ST trim value for bank1 and write it down...do the same for bank2. Repeat this step, for EACH bank with engine at 2500 RPM in park (hold at 2500 for at least 30 seconds so trims update). Now, you have the total trim values for each bank at idle and at 2500 RPM. What should the values be? Total trim +/- 5 is good, +/- 10 borderline any thing greater is code setting territory. If trim numbers are high at idle and in range at 2500 rpm you have a vacum leak behind the mass air flow sensor. Or a faulty MAF. Pay particular attention to the air inlet hose clamps behind (between MAF and engine) the MAF. Also use ford parts only.

Hi
171 system too lean
174 system too lean
2195 - 02 ozygen sensor signal stuck lean Bank1 Sensor 1
2197- 02 ozygen sensor signal stuck lean Bank 2
Sensor 1
The 2 front 02 sensors are located on the front of
the exhaust manifold.
Should solve problem and increase gas mileage.

This hose located at left front behind the brake disk, when the repair man fix your break who didn’t put right, when he put in was twisted.

1. Do you know how to put a pat on you disk?
2. Do you have tools to fix your brake?

If you know and you have the tools, that you can try, and I am willing to help.