Lambda sensors - Where, Why and how Much ?

[Len Sabatine]

At 12:54 PM 6/8/00 -0400, you wrote:
>The heater element of the O2 draws an ton of current and voltage compared to
>the O2 sensor end of it.  You don't want the heater ever finding a ground
>thur the sensor input
>Grumpy
>
>
> > > > > -- One of those wires goes to the Ho2s [ Heater ] One of the ground
> > > > wires is redundent.
> > >          Len
> > Then why did they put 2 ground wires in?
> > Squash
>
>Or to put this in a different perspective , the PCM isn't going to 
>appreciate having a signal ground
  shared with a high current draw heater circuit. All that noise ringing 
back into that discreet signal line.
Ouch. Its a real plus to also have more than a surface ground on the 
sensor, which can become
unreliable , even on OBD2 vehicles. Don't get the ground wires mixed up in 
position , hint,hint.

Len

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