P0411 Sec. Air Inj. Sys. Incorrect Flow Detected
Your engine is a V6, so the Air Pump has to supply air to both
exhaust manifolds of the engine. If one side delivers air into
the exhaust but not the other side, the engine computer is able
to recognize this via the O2 sensor and will set a code.
Since your fault code does not specify 1 side, it is most likely
a fault that is affecting BOTH sides, caused by:
- a blown air pump fuse
- a bad air pump relay
- broken plastic air tubes
- faulty vacuum solenoid valve
- broken vacuum hose
The blue line is fresh air from the air filter housing to the Air
Pump and then to the Combi Valves.
Check the thick plastic tubes for any cracks / holes.
The green lines are small vacuum hoses that deliver vacuum to the
combi valves 5 & 9.
Yellow FEEDS vacuum to the Vacuum Solenoid.
If the vacuum solenoid does not open when triggered by the ECM, then
the combi valves will not open and no air fill be delivered into
The first thing to do is to manually turn the air pump ON by removing
the Air Pump Relay and bridging the big terminal connectors such
as in this video I made for a 1.8T engine.
Your Air Pump Relay should be located in the E-Box next to the
Engine Computer: (under plastic cover in engine bay at base of
Bridge the pins. Does the pump run? If no, does one of those 2
pins have power (check with a test light). If no, then the fuse
might be blown (located in front of relay).
If one of the pins has power, but the pump does not run, then you
probably have a bad pump. The pump is located under the car
below the air filter housing
Start with bypassing the relay and then post your results.
Saturday, October 13th, 2012 AT 1:57 AM