Ford
1998
Taurus
3.0 V6
Automatic
Service Engine Soon Light On
P0411 Secondary Air Injection System Incorrect Flow Detected.
No unusual operating conditions experenced.
I bought a Chilton's repair book.
I troubleshot the Secondary Air Injection System according to the book.
I found nothing wrong.
The system had good air flow to the diverter valves for about 60 seconds when the engine was cold.
The vacume was good to the deverter valves for the first 60 seconds when the engine was cold.
After the 60 seconds I couldn't feel any backflow from the deverter valves.
My Question is this. Is there any other system that could give this code. Maybe a faulty sencer or something.
Or could it be just a faulty PCM ?