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2003 Audi A4 Quattro 3.0L engine code P0413 - secondary air injection solenoid (n112)

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Old 04-18-2017, 06:48 AM
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this website has a lot of useful information:

Audi Workshop Manuals > A4 Sedan V6-3.0L (AVK) (2002) > Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Locations >
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Old 04-20-2017, 03:08 PM
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Originally Posted by Steamboat
I meant N112.

Hi, so I installed the new solenoid and reset the code... the engine light came back right away and is throwing the same code... what should I do??? This is driving me insane... :/
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Old 04-23-2017, 05:59 PM
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Did you check the wiring to the solenoid? That's the only thing left that I know to do.
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Old 05-13-2017, 08:24 AM
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Update: all I needed to do was change the relay and now it's working fine! Thank you for the help
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Old 05-13-2017, 04:30 PM
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Thanks for following up with the solution to your problem.

What relay did you replace?
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Old 05-28-2017, 11:47 AM
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It turned out to be the 373 relay that had gone bad and needed replacing 😅😅
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Old 05-28-2017, 11:47 AM
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It was under the ecm
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