Secondary Air Injection System Air Flow/Pressure Sensor Circuit Low Bank 1

What this code means

The secondary air injection system air flow or pressure sensor is reading a signal that is too low on Bank 1. This affects the system that pumps air into the exhaust to reduce cold-start emissions.

Symptoms

• Check engine light on
• Failed emissions test
• Rough running at cold start

Common causes

• Faulty secondary air pressure sensor
• Wiring or connector fault at sensor
• Blocked or leaking air hose
• Faulty secondary air pump

Diagnostic steps

1. Check for stored codes and freeze frame data
2. Inspect secondary air sensor wiring and connector
3. Test sensor signal voltage with scan tool
4. Inspect air hoses and pump operation

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