My computer shows this but not sure what to make of it ! A NY help please.

 

It would be extremely helpful to know vehicle details such as mileage or drivability issues, and what DTCs are stored in the system.

 

2005 s type 3lt ful consumption is really the only issue I have , it says 7 kilometers to 1 liter.
l just don't know how these fails can be rectified.

 

As it fails to say which sensor(s) those are useless.

Have you any problems with the car?

 

They refer to all 4 up and down stream o2 sensors. I've changed the normal problem one ,upstream 2, but I think the voltage supply is suspect? Thanks for your imput. I've disconnected battery and fitted new battery. Without effect.

 

I noticed your scanner display states those voltage values are calculated. It's not actually measuring the supply voltage, but inferring what it thinks is present. What algorithm is used? Who knows?

If you're not getting any relevant OBD fault codes, I'd ignore those likely inaccurate calculated numbers. If it's really bugging you, get under the car and take a direct voltage measurement.

Thinking about it a bit more, I'm not sure O2 sensors even use a reference voltage like other sensors do. Two circuits within a modern O2 sensor:

1) The sensor portion itself is a voltage generator, roughly akin to a small battery. The voltage output varies with the oxygen content. No reference voltage.

2) The heater portion brings the sensor up to operating temperature quickly. It's just a tiny electric heater, controlled by the engine computer. Once again, no reference voltage.

 

Thanks for the reply, I run it every day and it goes really well but the fuel consumption is my main concern. It used to be 9.5 kilometers to the liter nowits 7 ish. Air Filter is good no codes come up apart from hand brake fault .

 

Hmm, just thinking out loud but perhaps the rear brakes are dragging slightly? (Edit) The engine would have to work a little harder, but wouldn’t register as a fault. It would be similar to pulling extra weight, such as a trailer or trunk full of bodies.

Do you have an infrared thermometer? Quite inexpensive these days. Go for a test drive with a bare minimum of brake usage. On an empty stretch of road, pull over and coast to a stop without using the brakes. Measure the temperature of all four brake discs. If any are substantially hotter than the others, that could be the culprit.

 

The upstream O2s are sensed by current. Ignore voltages.

You'd do better to look at fuel trims & of course OBD monitors if unset.