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Hi all gutted my pre cats now have engine light on any ideas! I also had the air box out but have checked all and it seems ok thanks stew

You either need lambda spacers (I’ve got a pair for sale) or a remap

From MRC website:
PRECAT REMOVAL
Removal, or gutting, of precats from your standard downpipes. The 400 cell precats are removed leaving your 200 cell main cats giving you a lot less restrictive pair of downpipes. Lambda sensors are left in original positions.

*Requires a Stage 2 remap, as the rear lambdas are used to test for precat efficiency and this will fail the test if not coded.

Thanks guys I indented to remap I take it will do no harm for a while I have mot Friday will it pass ok thanks for the replies stew

the rules are or are going to change regarding engine lights[not sure if they have implemented this yet] it can fail if one is illuminated
if it doesnt come on right away turn it off before you drop it into the testing station for now

Thanks Arthur lights on all the time I thought I'd get a while before it would come on after changing the cats I haven't even drove it and the light came on my luck I hope I get a sympathetic tester as here in Northern Ireland it government mot testing stations

I've gutted mine and no remap but I do have spacers fitted I've heard they can pass the emissions test but you got to get the car up to temp before they test it

Hi all just passed mot in Northern Ireland with no spacers engine light was on but the guy said it makes no difference they can't fail you on engine light being on !! Now for a remap