IVA emissions and self centering

[Bobnic]

Hi guys. Should have an IVA date for the end of June hopefully, so not long to go!! Car's running well, drives and stops nicely. Two big things left are the emissions and self centering. Used my local friendly garage's emissions tester like they use in an MOT. The lambda reading came up as 3, should be around 1. This is basing the test against the 1994 criteria for the donor M3 E36 1994 engine. Will the IVA tester use this benchmark, or resort to the earlier test criteria?? If it's the earlier, it's fine, if it's to the 1994 criteria, we have a problem. Do you think I need to change the lambda sensors, or is an air leak in the breather/exhaust system more likely a cause??? Struggle to unravel the flow charts in the IVA manual, me being thick is the main problem I fear!!

Also, really struggling to get the steering wheel to self centre at all, have tried adding toe out as suggested by Patrick on his website, hasn't really made any difference, any other ideas please??

Yours nervously

Rob