The O2 sensor after the catalytic converter.
It just has ( 1 ) oxygen sensor , before the catalytic converter ( upstream )
the o2 sensor is located on the exaust manifold
There is one upstream and one downstream.
bank 2 is the drivers side of the engine sensor 2 is after the exhaust has passed through the catalytic converter ( downstream )
bank # 2 is the drivers side of the engine sensor # 2 is after the catalytic converter ( downstream )
P0141 - downstream heated O2 sensor heater circuit fault ( Bank 1 ) according to my Haynes repair manual ----------------------------------------------------------------------------------------- P.S. bank 1 is the passenger side of the engine , the downstream oxygen sensor is after the catalytic converter ( or sensor 2 )
the upstream O2 sensor is directly below thethe exhaust manifold flanges, above the catalytic converter. The downstream O2 sensor is in the exhaust pipe. Disconnect the electrical connectors and screw it out
I believe there is an oxygen sensor in each of the exhaust manifold outlets ( 2 ) on a 1993 Ford Ranger 4.0 liter
I was looking in my Chilton book at the engine wiring schematic for a 1993 Ford Ranger 2.3 liter 4 cylinder and I only see ( 1 ) heated oxygen sensor
On your 2003 Ford Ranger , 4.0 liter SOHC , V6 : Bank 1 is the passenger side of the engine Sensor 1 would be close to the engine BEFORE the exhaust enters the catalytic converter Sensor 2 would be AFTER the exhaust exits the catalytic converter
The speed sensor on a 99 Ranger 2.5 liter 2WD with an automatic transmission is in the rear differential. It is included with the ABS sensor in one unit.
If it's like a 1991 Ford Explorer ( with the 4.0 liter V6 engine ) It has ( 1 ) oxygen sensor