BMW E85 2002-2005 Z4 3.0i ROADSTER DISA M54 3.0 VALVE UNIT FLAP REPAIR KIT X8R42 Product Description: Our repair kit in this listing addresses the common failure of the BMW DISA 3.0 ltr intake adjuster valve unit. Our components described herein with the assistance of our supportive instruction media will allow you to replace the faulty components which always fail within the DISA unit, without having to replace it with another OEM part that is going to fail again due to the same manufacture faults. An extremely common fault corrected by our repair kit. Symptoms of fault: The symptoms of this fault are very obvious;Displaying DTC codes and a loss in low end torque. There may be a rattling, buzzing or clicking noise coming from the engine. Fault codes: lean condition(P1083, P1085), front oxygen sensor lean (P1090, P1092) oxygen sensor slow response (P1087, P1089) and cylinder misfire (P0311-P0316) fuel control mixture lean (bank 2 sensor 1) and p0174 system too lean, showing? The solution: Fit our improved design billet aluminium flap kit, designed to never fail, save the cost of a replacement DISA valve which will only fail again. Using our kit, the weak components of the DISA valve flap and crank lever are replaced with our many times stronger billet aluminium parts, retained by our precision machined screw, which tightly holds the two components together; eliminating wear and the need for the retaining pin which can enter the engine. You will receive: Our repair kit includes all the components you will need to restore your BMW DISA unit, you will recieve the components shown above. Instructions:1) https://youtu.be/kIq7QJpRnRw 2) https://www.x8r.co.uk/ebay_x8r/instructionspdf/Bmw-DISA-Valve-Unit-Rattle-Repair-Fix-Kit-Rattling.pdf