Fitting a replacement, cleaner engine
For some long-life vehicles, eg specialist vehicles or buses, replacing the existing engine with one that is of a higher emissions standard may be an option (also referred to as “repowering”). This may be particularly relevant if the engine needs replacing as part of the maintenance of the vehicle anyway. This change to your vehicles emissions will need to be certified. Different countries have different approaches to this. In some countries you may be able to have the change made on your vehicle registration papers, or provide other proof for the LEZ authorities.