Skip the auto shop - Our mechanics make house calls

How to Replace an Air Pump Check Valve

air injection 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P0608 OBD-II Trouble Code: Control Module VSS Output "A" Malfunction
P0608 means there is an malfunction in the vehicle speed sensor A control module often due too faulty speed sensor or shorted electrical wiring.


Related questions

Q: I have issues with my air suspension. I have been reading through the forum of the topic, and I believe it has to do with my compressor.

The pump will become loud when it is under pressure and lifting a load. If the pump is quiet and you hear a hissing sound around where the pump is, either the pump is leaking or the main supply hose...

Q: Car spits out white smoke when started after sitting for a short time

I have seen this many times on this engine. When this occurs during startup it is because of failed valve stem seals. In some cases the piston rings may be leaking also, but you would get smoke all the time...

Q: Problem with secondary air injection and the idle is hunting.

Hi there. When the air pump is working and the engine is running fine and then when the air pump is turned off and the engine idle starts to hunt, then there may be water in the air pump or...