CAMSHAFT ADAPTER SOCKET KEY SAME AS T40079 / T40269 Application: For tensioning the timing chain with the camshaft adjuster. Used to rotate the cam phasers when tightening the timing chain. T40079: for Audi from '05 & up, including A6, A8, A8L, Q7, RS4, S5, S6, S8 T40269:for Audi A6 2011> Aud A7 Sportback 2011> Aud A8 2010> 8~cyl., 4.0l TFSI direct injection engine.