Standard Motor Products Secondary Air Injection Sensor

Standard Motor Products Secondary Air Injection Sensors: Precision Emissions Control

When a secondary air injection (SAI) system starts misbehaving, the culprit is often a failing sensor—and getting the diagnosis and fix right the first time depends entirely on the quality of the replacement part. Standard Motor Products (SMP) has built its reputation over more than a century as one of the most trusted names in emissions and engine management, making their secondary air injection sensors a go-to choice for professional technicians and serious DIYers alike.

What Secondary Air Injection Sensors Do

The secondary air injection system pumps fresh air into the exhaust stream immediately after a cold start, accelerating catalytic converter warm-up and dramatically reducing hydrocarbon and CO emissions during that critical first few minutes of engine operation. The SAI sensor—typically functioning as a manifold absolute pressure (MAP) sensor within the air injection circuit—monitors system pressure and reports back to the ECU, allowing the engine control system to verify that the pump and valves are operating correctly. A degraded or failed SAI sensor can trigger fault codes, illuminate the check-engine light, and cause a vehicle to fail emissions testing, even if the mechanical components of the system are still sound.

SMP's AS-Series: Engineered for Accuracy and Durability

Standard Motor Products offers secondary air injection sensors under their well-known AS-series part numbering, with part numbers such as AS440, AS447, and AS481 covering a range of European import applications including Volkswagen and Audi platforms. SMP's Intermotor line has added significant sensor coverage including secondary air injection sensors, specifically targeting the import vehicle segment where these complex emissions systems are most common.

Advanced engine systems are dependent on timely, accurate data from multiple sensors; to ensure these systems operate as designed, Standard engine sensors are precision-engineered for accuracy, speed, and durability. Each SAI sensor in the lineup is designed as a direct-fit replacement, with connectors and terminals constructed to OE specifications for a plug-and-play installation that restores peak system conductivity without modification.

Standard engine sensors are subjected to extensive testing in the lab, on actual vehicles, and end-of-line tested to ensure quality. Each sensor is also extensively tested and validated to ensure precise performance in extreme conditions. This rigorous validation process is especially important for SAI sensors, which must perform reliably during cold-start conditions when temperature swings are most severe.

Coverage for Import and Domestic Applications

Standard provides coverage for all import and domestic vehicle applications equipped with gas, hybrid, and electric powertrains. Their secondary air injection sensor offerings are particularly well-suited for European import vehicles—platforms notorious for complex SAI systems—where fitment accuracy is non-negotiable. With over 100 years in business, Standard Motor Products is a leader in the industries it serves.

Why Choose Standard Motor Products for SAI Sensors?

• OE-quality fit: Direct-fit design matches original equipment connectors and terminal configurations exactly
• Proven AS-series lineup: Dedicated part numbers (AS440, AS447, AS481) for specific import applications
• Intermotor import expertise: Specialized coverage for European vehicles where SAI systems are most prevalent
• Rigorous validation: Lab, vehicle, and end-of-line testing before any part reaches the market
• Century of trust: Standard Motor Products has been serving the automotive industry since 1919

For technicians chasing an emissions fault or a P04xx trouble code related to the secondary air injection system, Standard Motor Products delivers the sensor-level accuracy needed to get the repair done right the first time. Browse the full selection of SMP secondary air injection sensors above to find the correct part for your application.