The combination valve, or combi valve as it’s called at times, is a pneumatically actuated shut-off valve that is integrated into the valve housing and allows the SAI pump to add air to the exhaust gasses during start up and open loop to help with emission control.
If you are getting a fault code on your dash, it could very well be the combi valve that’s the problem. When these go bad, it can lead to malfunction in your SAI pump. These parts can get filthy over time and when they do, they will need to be replaced to give your vehicle that performance you remember.
This Part Fits the Following Vehicles