Lambda probe group 031 showing Volts not AFR

[tonipieleanu]

I'm using Vag-Com 3.11 and in group 031 I'm getting a reading in Volts and not the actual AFR (lambda).

Does this mean my lambda probe is narrowband? I haven't seen the voltage on this channel fluctuate other than 0-1V. Is the reading wrong or has something to do with the lambda probe itself and the ECU.

I have some lambda probe issues even after changing it (with a NTK/NGK one, which should be equivalent to a OEM probe).

Cheers

 

[byd1380]

Should be a wide band lambda, if you multipy the voltage by 14.7, this will give you AFR. ie 0.75 Volts = 11.025AFR

Cheers

Ivan

 

[tonipieleanu]

That's true only if the reading is lambda factor, if it's a voltage reading the it depends on the sensor type.
For narrowband sensor de equation is non-linear, it's actualy a logarithmic dependency of voltage.

 

[L.R.C.]

0-1v = narrow band

if it was wide band you would have seen values larger than "1" (especially when you let off throttle after acceleration)