OBD Guide

P0419

AIR System Control B Circuit

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine Light Is On
  • Reduced engine efficiency
  • Increased emissions of harmful substances

Causes

  • Open or short circuit in wiring harness
  • Solenoid valve malfunction
  • Problems with the engine control unit (ECU)
  • Contamination or blockage of the secondary air supply system

How to Fix

  1. Check the wiring harness for damage
  2. Check the operation of the solenoid valve
  3. Clean the secondary air system
  4. Check engine control unit (ECU)

Related codes

Error P0419 by Vehicle Brand