Skip to main content

P1423 – Secondary Air Injection System Flow Too High

Want to confirm the real cause of this fault code?

A high‑quality OBD2 scanner gives you live data, fuel trims, sensor readings and freeze‑frame information — exactly what you need to verify the root cause of this code with confidence.

View Recommended Scanners

Symptoms

  • Rough idle
  • Lean condition
  • Emissions failure

Causes

  • Stuck valve
  • Vacuum leak
  • ECU issue

Diagnosis

  • Check valve movement
  • Inspect vacuum lines
  • Scan ECU

Repair

  • Replace valve
  • Repair vacuum leaks
  • Update ECU
Hit enter to search or ESC to close