Northstar Engines and System Technical Discussion Discussion, Got Code P1415 Please Help in Cadillac Engine Discussion; Hello everyone, I'm new to the board. Can anyone help me with this code P1415 on a 2002 Deville DTS....
Hello, jfrench830 and welcome to the Cadillac Owners Forms!
P1415 is Secondary Air Injection System - Bank 1, which is the rear bank of the engine.
Here's what you do, test the rear SAI shut off valve with a vacumm pump, the valve should hold vacumm and open when 10" of vacumm is applied. The diaphram in the valve is a common failure. Another thing that could be wrong is the vacumm line that goes to the shut-off valve could be loose, cracked, or plugged. The vacumm soruce to the valve comes from a solenoid under the engine cover, a lot of times the vacumm line gets knocked off during other engine repairs.