What is an air pump?
An air pump—also known as a secondary air injection pump or a smog pump—is a critical part of your car’s secondary air injection system. This system, which itself is part of the emissions system, injects fresh air into your exhaust system to produce a cleaner burn before the fumes exit the tailpipe. Secondary air injection systems are found on many modern vehicles with gasoline engines and serve to reduce the amount of harmful emissions your car releases into the atmosphere.
When should I replace the air pump in my car?
As there aren’t set replacement schedules for air pumps, you’ll only need to replace yours when it fails and is no longer sending airflow into the exhaust system. These are the most common symptoms of a faulty air pump:
Rough engine performance: A rough-running engine is one of the first signs of a faulty air pump. When the air pump goes bad, the engine might receive the incorrect air/fuel mixture, resulting in a rough engine idle or engine stalling issues.
Poor engine performance: It’s also common for a faulty air pump to result in engine performance issues. You may notice a reduction in horsepower, and your engine may hesitate or stumble during acceleration.
Check engine light (CEL): If your car’s computer system detects a problem with the air pump, you’ll likely notice the check engine light appears on your dash. That said, the light may appear for a variety of reasons, and you’ll need to use an onboard diagnostics (OBD) scan tool to determine the actual cause.
Keep in mind: That these issues may indicate other issues with the fuel or exhaust system, like a faulty O2 sensor. To accurately diagnose your car’s problem, you should visit a certified mechanic.
How often should I replace my air pump?
Automotive manufacturers don’t typically provide replacement schedules for air pumps—you only need to replace yours if it fails. Some of the top signs that point to air pump failure include a check engine light and reduced engine performance.
Can I replace my air pump myself?
An air pump replacement can be a great DIY project for home mechanics with mid-level experience. It requires intermediate mechanical knowledge and basic tools. But with the right guidance, even novices shouldn’t struggle to complete the replacement.
That said, if you’re uncomfortable replacing the air pump yourself or don’t have access to the right tools or an appropriate space, you should contact a professional mechanic.