BMW Air Pump Check Valve - Vemo V20-66-0021

Product Information

The secondary air injection pump check valve helps reduce emissions by injecting extra air into the exhaust stream during cold starts. This additional air aids in burning any unburned fuel and reduces harmful emissions, particularly carbon monoxide and hydrocarbons, before the catalytic converter reaches operating temperature. The check valve is responsible for directing air into the exhaust and preventing exhaust gases from flowing back into the air injection pump.

• Check Engine Light: A common sign of a faulty check valve is the check engine light illuminating. The ECU will detect issues with the air injection system and log related error codes, such as P0410 or P0411
• Poor Engine Performance: When the check valve fails, you may experience rough idling, hesitation, or reduced acceleration, as the secondary air injection system plays a role in optimizing cold starts and early engine efficiency
• Increased Emissions: A failed check valve can lead to a rise in emissions due to unburned fuel in the exhaust. This issue might only be noticeable during an emissions test, but if left unresolved, it can impact the catalytic converter over time.

About Vemo

The premium brand VEMO is known as a specialist in sensors and exhaust gas recirculation. Besides continuous product development in the field of EGR, VEMO is also a leading manufacturer of sensors, switches, relays and air suspension on the aftermarket. With our VEMO Expert Kits+, we help you carry out fast, cost-effective repairs and save you time and money!

The VEMO range includes high-quality products suitable for European vehicles such as VW, AUDI, BMW, MERCEDES-BENZ and PSA, as well as for those from Asian manufacturers such as TOYOTA, KIA and many more. The premium brand VEMO is characterized by its customers’ continuing trust and the benefits of extensive experience in the automotive industry.