Close

Air Pump Check Valve

By Bret Bodas, July 4, 2008

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

Symptoms of a Bad or Failing Air Pump Check Valve

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

Air Pump Check Valve 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.

No comments yet...

Sign in to comment

Related Questions

See what others have asked about this, or visit the Questions page to ask your own question.
cooling system
Just changed water pump and thermostat due to overheating. immediately, heat blew out not so warm. then flushed and...
air in coolant system
Do anyone know how to get the air out of the coolant system on the 3.9 & 3.0