Oxygen/Lamda Sensor Test G60

[gollfy 0]

I need to check my lamda/oxygen sensor is working as MOT time is looming :cry: and it was a slight problem last year but MOT bloke let it through luckily for me. :D

I've searched the forum for the info but cant find it, but can remember someone telling me last year.

 

Thanks all.

[Riley 0]

iirc...

 

Ignore the 2 white wires (they are for the heater element)

You want 0.1v - 0.9v pulsating at the purple (i think) wire at tickover...

 

Best to have someone confirm the above...

 

Neil.

[gollfy 0]

Thanks Neil

 

Just need to know where to put both my probes :roll: ooeerrr

as I'm not an electrician

[Riley 0]

Earth probe to earth...(exhaust will do)

Posi probe to the purple (i think!) wire...the voltage should change every second between the above numbers.

 

Its a case of either being under the car and probing in the lambda sensor plug,or opening the loom up in the engine bay.

 

Pretty sure thats right.

 

Neil. :)

[gollfy 0]

A big thanks 8) for your help

[Riley 0]

No worries m8 :) edited above post.

 

Ive used the under car method before...just remember safety is imperative! 8)

 

Neil.

[flusted 0]

and yes its the purple wire on the vw loom and i think black on the lamda loom

[JMC 0]

It should be easy to identify the wire that should having the pulsing signal. There are 3 wires together and one by itself but all in a line. The one by itself is the one you want (and should pulse around 1v on tickover, just put the multimeter probe down the back of the plug, that worked for me).

 

On mine it takes a few minutes to warm up though, before it starts to oscillate.

[Tempest 0]

Leave the plug conected as far as possible, otherwise the Lambdaprobe won't work, as the ECU will no longer get a pulsating signal, and no longer work as a 2-point controller. The ECU in effect constantly oscillates between rich and lean mixture settings in response to the 2 oscillating values being read from the probe.

 

Tempest

[shawshankkid 1]

What should the meter be set at ? been a while since i've done it.......2-20-200-500 ? ac or dc ?

[Tempest 0]

dc and 2 Volt range will do.

 

Tempest