Since the 70s, emissions have been a major factor in the development of new automotive technology. It started with catalytic converters, then EVAP systems, and then OBD-II, which electronically monitors all emissions systems. Some emissions systems are just designed to curb harmful pollutants,...

If you've been paying attention to Volkswagen the last few years, you've surely noticed their gradual shift to direct injection. It offers better fuel economy, more power, and lower emissions than standard port injection. But this technology is so different from the old that not many people know...