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[twiglet]

I've finally completed the job of moving my lambda sensors in an attempt to prevent codes 0420/0430 bringing my EML on.

On completion I fired up the old girl, only to find that the EML is still on

I'm just wondering if I need to get the codes cleared now with a tech2 or similar, or whether the EML should reset itself?

TIA 

[Entwood]

Some codes reset as soon as the fault condition goes ... crank sensor for example

Others need a certain number of "clean" starts  .. 20 I think.

Some need to be reset - air bag light for example.

Doesn't need to be a full Tech2 to reset 0420/0430 ...  a generic reader wil do those ... even a cheapy ELM327 but a reasonable OBDII reader like the Maxscan GS500 makes it very simple ..

Perhaps someone near you has a generic reader ??

[twiglet]

Cheers Nigel. I thought this may be the case! 

Is there anyone in my neck of the woods (Suffolk) with a code reader I wonder???  :-/

[twiglet]

Tried the '20 clean starts' theory today, but the EML remains on!

Does anyone know if the 0420/0430 codes definitely need a reset to clear them?

Still looking for someone local with a code reader... 

[Jimbob]

420 and 430 are iirc linked to learned data, so the car will learn they are putting in different values and no longer trigger the error condition.

They werent flagging a fault, but a threshold breached.

You may find it just goes off after a month or 2 of driving.

Its also one I think a battery disconnect may help with, once the car is used to the new readings, as Im sure that resets learned values (nothing to do with fault codes)

[twiglet]

420 and 430 are iirc linked to learned data, so the car will learn they are putting in different values and no longer trigger the error condition.

They werent flagging a fault, but a threshold breached.

You may find it just goes off after a month or 2 of driving.

Its also one I think a battery disconnect may help with, once the car is used to the new readings, as Im sure that resets learned values (nothing to do with fault codes)

Thanks Jimbob.  On the subject of the battery disconnect, how long does the battery need to be off for? Do I need to reset anything after its reconnected (eg,  radio code, windows, etc)?

Cheers 

[davethediver]

420 and 430 are iirc linked to learned data, so the car will learn they are putting in different values and no longer trigger the error condition.

They werent flagging a fault, but a threshold breached.

You may find it just goes off after a month or 2 of driving.

Its also one I think a battery disconnect may help with, once the car is used to the new readings, as Im sure that resets learned values (nothing to do with fault codes)

Thanks Jimbob.  On the subject of the battery disconnect, how long does the battery need to be off for? Do I need to reset anything after its reconnected (eg,  radio code, windows, etc)?

Cheers 

Leave battery off for 10-15mins i think, and radio will probably need resetting as well as one touch window