Hella 7.21857.01.0 Secondary Air Injection Pump

The Hella 7.21857.01.0 is a secondary air injection pump engineered to OE specifications for precise fit and reliable performance. Secondary air injection (SAI) pumps play a critical role in a vehicle's emissions control system, pumping fresh air into the exhaust stream during cold engine starts to accelerate catalytic converter warm-up and significantly reduce harmful cold-start emissions.

Key Features:

• Manufactured by Hella, a globally recognized OE supplier of automotive components and electronics
• Direct OE-equivalent replacement — engineered to meet or exceed original factory specifications
• Helps reduce hydrocarbon (HC) and carbon monoxide (CO) emissions during cold-start engine operation
• Designed for durability in high-heat, high-vibration underhood environments
• Supports proper function of the secondary air injection system, helping prevent check engine lights related to emission control faults
• Manufacturer Part Number (MPN): 7.21857.01.0

As a leading OE and aftermarket supplier, Hella produces secondary air injection pumps to the same standards used in original vehicle assembly. Replacing a failed or degraded secondary air pump with an OE-quality Hella unit restores proper emissions system performance and helps maintain emissions compliance.