Vehicle recall defect – Pierce Is Recalling Certain Model Year 2011 Arrow Xt, Custom Contender, Dash Cf, Impel, Saber, And Velocity Emergency Vehicles Manufactured From January 24, 2011, Through April 19, 2011, Equipped With A Cummins Isb, Isx, Isc, Or Isl Diesel Engine. The V-Band Clamp Assembly, Part Numbers Q187684, Q187685, And Q187686, Used To Connect The Inlet And Outlet Cone SeCTIons To The Diesel Oxidation Catalyst (Doc)/Diesel Particulate Filter (Dpf) Include A T-Bolt Which Can Fracture And Fail When Subjected To Stress Or Load. A Fracture Or Failure Of The T-Bolt May Cause The Clamp To Loosen And The Inlet Or Outlet SeCTIons Attached To The Doc/Dpf Housing To Disconnect.