How to Replace an Air Pump Check Valve

The air injection system is used to reduce hydrocarbon and carbon monoxide emissions. The system does this by introducing oxygen into the exhaust manifolds during cold engine operation and into the catalytic converter during normal operation.

An air pump is used to force air into the exhaust system. The powertrain control module (PCM) directs pumped air to the desired location by operating a control valve. A one-way check valve is also used to prevent exhaust gases from being forced back through the system in the event of a backfire or system failure.

If you notice any signs of a failing air pump check valve, you will need to replace it.

Part 1 of 2: Locate and remove the old air injection check valve

You will need a couple of basic tools to replace your air injection check valve safely and efficiently.

Materials Needed

  • Free repair manuals - Autozone
  • Protective gloves
  • Repair manuals (optional) - Chilton
  • Replacement air pump check valve
  • Safety glasses
  • Wrench

location of the air injection check valve

Step 1: Locate the air injection check valve. The check valve is generally found near the exhaust manifold.

On some cars, like the example shown above, there may be more than one check valve.

disconnecting the hose

Step 2: Disconnect the outlet hose. Undo the clamp with a screwdriver and carefully pull the outlet hose off the air injection valve.

show the hose removed and a wrench turning the bottom portion of the valve

Step 3: Remove the check valve from the pipe assembly. Use a wrench to carefully remove the valve from the pipe assembly.

  • Note: In some cases, the valve might be held in place by a couple of bolts instead, which must be removed.

Part 2 of 2: Install the new air injection check valve

installing the new air injection check valve

Step 1: Put in the new air injection check valve. Install the new air injection check valve on the pipe assembly and tighten it down with a wrench.

reinstalling the hose

Step 2: Put back the outlet hose. Reinstall the outlet hose on the valve and tighten down the clamp.

If you prefer to leave this task to the professionals, a certified technician from YourMechanic can replace the air injection check valve for you.


Next Step

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Recent Car Air Pump Check Valve Replacement reviews

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Vladimir

10 years of experience
214 reviews
Vladimir
10 years of experience
Chevrolet Silverado 1500 V8-5.3L - Air Pump Check Valve - Sacramento, California
Good guy.. gets straight to it thanks

Dan

39 years of experience
975 reviews
Dan
39 years of experience
Pontiac Grand Prix V6-3.8L - Car Air Pump Check Valve Replacement - Lawrenceville, Georgia
Dan is an excellent mechanic, arrived on time and immediately got to work. It was an absolute pleasure to have him work on my vehicle.

Andrew

11 years of experience
337 reviews
Andrew
11 years of experience
Mercedes-Benz SLK230 L4-2.3L Turbo - Air Pump Check Valve - Baltimore, Maryland
Great job. Fast and efficient

Brian

21 years of experience
109 reviews
Brian
21 years of experience
Chevrolet Corvette V8-5.7L - Air Pump Check Valve - Tolleson, Arizona
Brian was on time, very honest, completed job timely, and kind. I was lucky to discover him.

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