No voltage to my scanner on 02 sender on 98 3.0

 

Welcome to the forum

1998 3.0l will have three O2 sensors
S11 - bank1 sensor 1, passenger side, or B1S1
S21 - bank 2 sensor 1, drivers side, or B2S1
S12 - bank 1 sensor 2, or B1S2

O2 sensors read OXYGEN Levels in the exhaust, not fuel levels, they need to be heated above 600degF to work, they have internal heaters, 2 of their 4 wires are for the heater, but still takes a few minutes from a cold start for them to start working, even with 1,000degF exhaust temps
There is a separate fuse in the engine fuse box for the O2 heaters, should be fuse #13 in 1998

Sensor 1's are close to the engine, called "upstream" O2 sensors, they are used by the computer to adjust Fuel Trims, one for each Bank/side of the engine for V6 or V8 engines
Sensor 1 voltages change very very fast 10 times a second or so

Sensor 2 is located after the Cat Converters, it tests if Cats are cleaning up the exhaust or not, often called the "downstream O2 sensor", dual exhaust would have two of these, S22
Sensor 2 voltages are more steady, .7-.8 usually

The O2 sensor part generates it own voltage, range is .1 to .9 volts, so very low voltage range, .1v is Lean(too much oxygen), .9v is Rich(too little oxygen)
If upstream O2 voltages are not changing fast or stuck on .1 or .9 then you have a fuel system issue or major air leak in the engine

O2 sensors are monitored by the computer, and any problems will generate a code number, there are at least 50 DIFFERENT O2 sensor codes, each has a different meaning and context

Never.......EVER..........Google any engine code number, you will get marginal to very very poor advice at best

Look up codes on a full list, like this one: https://therangerstation.com/tech_li...II_codes.shtml

You can then see the OTHER codes the computer did NOT chose, which helps to narrow down why it choose the one it did