Low-emission strategies (Euro 6 in Europe and SULEV /PZEV in the USA)
- reduction of cold-start emissions
- rapid heating of the exhaust aftertreatment system
 EA211 – Secondary air pump (SAP) |  |
Pierburg side-channel SAP
 Setup and mode of operation |  Jetta Hybrid base engine |
The SAP normally extracts the air from the engine air filter via a line or, alternatively, its own secondary air filter. The air is pumped to the secondary air valve.
