Hella Secondary Air Injection Solenoid

Hella Secondary Air Injection Solenoids: OE Engineering for Cleaner Cold Starts

When it comes to emissions-critical components, few names carry the weight of Hella. As a globally recognized Tier 1 OE supplier, Hella has supplied automakers with precision-engineered electrical and electronic components for decades — and their secondary air injection solenoids are a direct extension of that OEM-level expertise brought to the replacement parts market.

Why the Secondary Air Injection Solenoid Matters

The secondary air injection system plays a vital role in reducing harmful exhaust emissions during the cold start and warm-up phases of engine operation. On average, up to 80 percent of the emissions of a driving cycle are emitted during a cold start. The catalytic converter is the primary defense against HC and CO emissions, but because the catalytic converter only works effectively from temperatures of approximately 300°C–350°C, emissions must be lowered during the cold start phase using different measures.

That's precisely where the secondary air injection solenoid steps in. The active secondary air system consists of an electric pump, the control relay, a pneumatic control valve, and a combination valve — all controlled by the engine control unit. While the system is working, the electric pump is switched on via the control relay, and the pneumatic control valve is actuated at the same time. The valve opens, and the vacuum from the intake pipe operates the combination valve, causing it to open so that the additional air conveyed by the pump is pumped into the exhaust pipe behind the exhaust valves.

A failed solenoid disrupts this entire sequence. Secondary air systems monitored by the engine control unit's self-diagnosis function cause the engine indicator lamp to illuminate in the event of faults. Beyond the check engine light, increased emission values during the cold start and warm-up phases can be caused by a lack of post-combustion when the catalytic converter has not yet reached its operating temperature.

What Sets Hella Apart in This Category

As a globally focused, top-tier supplier, Hella delivers premium, groundbreaking products, and the brand's extensive manufacturing experience, combined with cutting-edge technology and state-of-the-art facilities, makes it possible to deliver top-notch powertrain components, safety solutions, and premium-quality components. This philosophy carries directly into Hella's secondary air injection solenoid lineup.

Hella's secondary air injection solenoids are built to OE specifications and are designed as genuine OE-equivalent replacements. Noted as genuine OE from Hella, these 12V electric solenoid valves are engineered to exacting specifications and cover a broad range of European applications, with documented fitment spanning vehicles from Audi and Volkswagen to BMW. Hella part numbers such as 7.22880.01.0, 7.22295.62.0, 7.22778.97.0, and 7.22286.54.0 represent the brand's commitment to application-specific engineering rather than a one-size-fits-all approach.

Hella also publishes detailed technical documentation — including step-by-step diagnostic procedures — specifically covering the secondary air injection system, reflecting their deep understanding of how these components behave in the real world. The technical information and practical tips compiled by Hella provide professional support to vehicle workshops in their day-to-day work. That same engineering knowledge is baked into every solenoid valve they manufacture.

Choosing the Right Hella Secondary Air Injection Solenoid

• Match by OE part number: Hella solenoids are designed to cross-reference directly to OEM part numbers, making verification straightforward.
• Verify operating voltage: Most Hella units in this category operate at 12V and feature an electric actuation mode.
• Check for combination vs. control valve: Hella offers both pneumatic control valves and combination (check/shutoff) valve assemblies — confirm which component your vehicle requires before ordering.
• European vehicle fitment: Hella secondary air injection solenoids are particularly well-suited for VAG (VW/Audi), BMW, and related European platforms.