Question about Mercedes-Benz S-Class
This code is for the emission control system on the engine known as the "Air Injection Reactor" it helps to burn up any unburned fuel that is in the exhaust as it leaves the engine, it is an electric air pump and is turned on and off by the computer known as the "PCM" and the electric motor that drives the air pump is a common failure.The secondary air injection pump is sold as a complete assembly. this is the complete description from the book as well as possible causes.
P0411 - Secondary Air Injection System Incorrect Flow Detected P0411 Description An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module PCM grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction. Possible causes - Vacuum hoses damaged.
- Air Pump inoperative.
- Air bypass solenoid circuit open.
- Air bypass solenoid leaking/blocked or stuck open/closed.
- Air diverter valve leaking/blocked or stuck open/closed.
Posted on Apr 07, 2011
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Posted on Jan 02, 2017
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