What does the lambda actually do, no really ..

[andre]

I know it's supposed to measure the O2 level in the exhaust gas and then the ECU is supposed to use this info to adjust mixture etc. But how important is this on our 10 year old+ cars? Technology was a bit more basic back then. Does the ECU put much stock in the output of the lambda?

I replaced mine recently since VAGCOM was showing a No Signal error. Couple of weeks after replacing the unit I find the car surges at low speed/constant throttle. Quick search pegs the lambda as a possible suspect. So I unplug the new probe and now the car runs fine again. Is it really needed. What's the downside of not having one? Fuel economy? Performance?

[S2central.net]

I believe there is a specific lambda sensor for the RSA territory on the ABY S2 and RS2 because you don't run on CATs - is that correct ?

The lambda probe is an important sensor - regardless of vehicle age - its the only method for the ECU to make fuelling alterations based on O2.

Did you fit an original part, Bosch equivalent or el-cheapo replacement ?


Paul

[S2central.net]

Forgot to add... downside of a faulty or wrong probe is poor economy and part-throttle performance. Its not used at WOT...


Paul

[~Delta]

Aye, the Bosch Application list shows the Lambda Sond for vehicles used in SA to be specific to operating territory - allowing the use of leaded fuel.

[andre]

Thanks for the replies guys. The one I have I got off a forum member who had bought the RSA version by mistake. It is genuine. Of course we only have unleaded fuel here now so I don't suppose it makes a difference anymore, or does it? Maybe the probe I have is expecting/calibrated for leaded. Could this be a problem? The probe is definitely giving a reading (I can see it in VAGCOM). Could the wrong kind of probe cause the surging experienced?

Thanks

[S2central.net]

Yes - I think you should use the normal lambda probe for unleaded fuel !

[newsh]

Have you removed the fuses from the fuse box for a minute or 2 to cancel the stored faults? Of course I expect you 've done this in Vag com as you have it.

[andre]

Yep, have actually fitted a set of (incredible ) MRC chips since the lambda was changed so the ECU has been completely "rebooted" so to speak.

I'm going to try a standard lambda and see if that works.

Thanks guys