3 ms·
It's probably the secondary air pump (sometimes nicknamed the "Good Morning Pump" by VW owners) that operates when the engine is cold, to reduce pollution https
by snotrockets 11y ago
It's probably the secondary air pump (sometimes nicknamed the "Good Morning Pump" by VW owners) that operates when the engine is cold, to reduce pollution https://en.wikipedia.org/wiki/Secondary_air_injection https://en.wikipedia.org/wiki/Secondary_air_injection