What does engine light code. Air injection System flow/psi. Sensor bank 1 : short to ground mean on a 2009 Q5 audi? Or some clue as to what i should check. Thanks.
Potential causes include: Faulty exhaust manifold check valve A fuse or relay for the secondary air injection pump may be faulty A faulty air pump Leaking vacuum hose A bad vacuum control switch A dislodged a vacuum line A leak in the hoses/piping between the secondary air injection pump and the Combi or secondary air injection A sensor for the secondary air pressure may be faulty The combi valve itself is faulty The secondary air injection port in the cylinder head may be plugged with carbon The secondary air injection ports in the cylinder head may by clogged
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