Rosstech wiki states:
http://wiki.ross-tech.com/wiki/index...4/P1516/005398
17924/P1516/005398 - Intake Manifold Valve (N156): Open Circuit
Possible Causes:
1. Wiring from/to Intake Manifold Valve (N156) faulty
2. Intake Manifold Valve (N156) faulty
Possible Solutions
1. Check/Replace Intake Manifold Valve (N156)
2. Perform Output Test.
3. Use Scope to check Activation Signal while performing an Output Test.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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