If you're only getting a lean indicator and no other problems you might have a vacuum leak or possibly a problem with the EGR valve. The multiple misfires (assuming P0300 or specific cylinders, P0301 ~ P0306) sound like lack of fuel to the injectors causing misfires, also resulting in O2 sensors "sensing" lean mixtures as a result.
2001 ford f 150 misfire on acceleration
The Best Ranger Challenge - 2001 was released on: USA: 12 October 2001
I'm not a mechanic / technician but the automatic transmissions on a 2001 Ford Ranger would be electronically controlled , so there wouldn't be a modulator valve
how to replace water pump on 2001 ford ranger
not really
More than likely you are having Electrical issues with your 2001 Ford Ranger brake lights. Contact your local service dealer for further information.
why my 2001 for ranger v 6 dont have fire on the spark plugs
How many cold cranking amp do a 2001 ford ranger needs?
my ford 2001 ranger had the same thing happen to me i sent to the ford delear for repair and it was a missing fuse so check all fuses
The 2001 Ford Ranger ( SuperCab ) is 73.8 liters / 19.5 U.S. gallons
Spec Ops Ranger Elite - 2001 VG was released on: USA: 30 April 2001
repair manual fora front differential on a 2001 ford ranger edge