Unfortunately the failure doesnt always result in a check engine light as the valve can still be blown open by the boost pressure, so you may not be aware that you are losing power due to this. Our alternative is a fully engineered solution offering significantly improved reliability. Our valve is piston based with no diaphragm to fail, and of all aluminium construction. It replaces the original unit with a pressure/vacuum operated piston valve that still also retains the desirable OEM ECU control over valve actuation. All parts require for installation are included, together with full installation instructions.The item "Forge Motorsport Atmospheric Blow Off Dump Valve Mercedes CLA250 A250 2.0 Turbo" is in sale since Friday, May 1, 2020. This item is in the category "Vehicle Parts & Accessories\Car Tuning & Styling\Air Intake & Induction\Dump, Bypass & Blow-Off Valves". The seller is "spare654" and is located in West Yorkshire . This item can be shipped worldwide.