What Car? Q&A - When did BMW start Efficient Dynamics?
A: BMW introduced the Efficient Dynamics systems to the 1 Series in March 2007. However, some cars manufactured before that date are likely to have been registered after March, so you can't necessarily rely on the date printed on the registration document (V5C).
Your best bet is to check the official CO2 output, which is also printed on the V5C. If the car you're interested in matches the figures listed below, it will be an Efficient Dynamics model.