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Can a NA1 pass Euro 4+ Emission Standards?

Quick answer
NA1 probably not, NA2 maybe. For the later it may comply with the Euro 4 standard, but whether it would be universally accepted is a separate question.

Longer answer.
Manufacturers were required to comply with the new requirements on specific dates.
Therefore all new cars registered in Europe had to comply with Euro 1 on and after 31 December 1992, likewise; Euro 2 on 1st January 1997, Euro 3 on 1st Jan 2001 and Euro 4 on 1st January 2006.
However, some cars by some manufacturers met the standard before those dates.
The face lifted 3.2 cars sold into Europe (l believe) met the standard required by Euro 4. These cars can be distinguished by all the additional plumbing observable between the alternator and rear engine bulkhead. A check on the London ULEZ website shows that if you put in the UK registration of a run out (3.2 manual) model (NA2) it’s exempt, so presumably accepted as compliant, likewise a similar check on a 2002 car.
My own 1995 3.0 car (NA1) is not exempt.
If the car you are enquiring after is not a European car but is a US or JDM car; the answers may be completely different dependant on the variant of ECU fitted and local certifications.
So not a clear answer.
I would suggest perhaps posting on the UK forum nsxcb.co.uk to see if they can help. It may be of benefit to detail the year, origin and version of the car to allow a more precise answer.
Cheers.
 
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