mountainman

I have a computer that has removed the rear o2's. When I scan it it reads
.445V
99.4%

Russ K

iTrader: (1)

With the rear O2's removed or unplugged, the scanner will still report ~.450V. Not sure where your seeing 99.4%, as only fuel trims report % values. And that just applies to the front O2's.

Russ Kemp

mountainman

for example,
My scanner shows B2S2 V .445
B2S2 % 99.4

Russ K

iTrader: (1)

What kind of scanner? As only S1's will report fuel trim% values.

Russ Kemp

mountainman

Its an innova Equus 3040
it shows V and % for the front sensors and the rears

2xLS1

iTrader: (25)

I have an OTC Enhanced Monitor that shows the same thing for rear O2 trims.

Russ K

iTrader: (1)

Then your scanner is wrong, as there are no rear O2 sensor fuel trims.

Russ Kemp

mountainman

Then whats the meaning of the high percentage?

2xLS1

iTrader: (25)

Tell the engineers that designed the scanner. The one I mentioned is usable across multiple platforms. It is just a parameter that show up in the default list. Perhaps that is their way of displaying an unsupported parameter on these vehicles. Not every scan tool is going to respond the way HP Tuners displays things.

mountainman

So whats your opinion of the 99.4%?

2xLS1

iTrader: (25)

It's probably a PID that is not applicable to your vehicle.