where do i connect it up then? i know i connect it to the lambda but which cable??

its on an octavia by the way

it might be better to put in a seperated lambda probe for a afr meter.... it's fairly easy to do, drill a hole in the exhuast system and weld in one of those lambda probe bosses, which may even be supplied with the kit.

i bought a gauge on its own before knowing about wide band and narrow band gauges or that you can buy a kit so i have a gauge with a single signal wire so i assume its a narrow band gauge and i planned on plumbing it into the standard lambda unless it was overly difficult.

it may not be possible to do that, becuase the lambda singal is so weak it needs to be aplified before the 'brain' can make any sense of it, splitting the signal to two different destinations may cause damage to the ecu

sod it.

most afr meters will have a signal amplifier built in, but to be honest they normally come as a kit with the right probe and everything you need to install it

i have contacted the manufacturer as to whether its a narrow or wide band and what probe they suggest i use with it

The two probes you have on the car are the broadband (or wideband) before the CAT and the normal planer type behind the CAT. The one after the cat will be of no use to you so you need to know if it works with the broadband type probe.

it may not be possible to do that, becuase the lambda singal is so weak it needs to be aplified before the 'brain' can make any sense of it, splitting the signal to two different destinations may cause damage to the ecu

:eek:

Mine works okay - well it gives readings anyway!

have a look here for details (scroll down a bit)

From 42 Draft Designs FAQ:

Which wire do I tap for my air-fuel gauge?

The black one. On all VW/Audi oxygen sensors and most others there will be four wires - one black, one gray, and two white. The two white wires are the heater wires. The gray wire is incoming power. The black wire is signal output. You need to tap the black wire of your sensor after is crosses over to the ECU wiring harness. Don't tap the black wire itself or you will have to remove your tap every time you need to take the sensor off.

There are five wires on probe one as its a broadband probe.

be careful, W/B have five wires... you can connect your gauge to this but it robs the signal from the ecu,... causing lots of engine running issue's,... best fit a unversial sender about

:saythat:

be careful, W/B have five wires... you can connect your gauge to this but it robs the signal from the ecu,... causing lots of engine running issue's,... best fit a unversial sender about

if you only have a four wire probe then your ok,..

I haven't noticed any problems with mine - should I be worried? I did use a very thin piece of wire to connect it, which I presume will help due to low resistance (?)

a smaller cable has higher resistance than a bigger one

think of it like a water pipe.

the resistance of cable wont make any difference.... after all a lambda probe is basically a variable capacitor

a smaller cable has higher resistance than a bigger one

think of it like a water pipe.

That's why I got an E in physics A-level

if you only have a four wire probe then your ok,..

Looks like I'm okay, phew!

Thanks.