Car encyclopedia

Air Pump Check Valve

The air pump check valve is a one way valve that allows air from the air pump to enter the exhaust system.

Symptoms of Wear or Failure

  • Check Engine Light may illuminate
  • Vehicle may fail an emissions inspection

Related Repair Advice

  • An air injection system trouble code isn't always triggered by a defective air pump check valve. It can also be triggered by a restricted passage or air pipe, a defective air pump, an air pump relay failure, or a wiring problem.
  • On a v-type engine with two check valves, it is often recommended to replace both check valves if a trouble code is set indicating the failure of one. The "good" valve may already be partially restricted, but not yet setting a trouble code.

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