Manufacturer-specific fault
16804 — Volkswagen
What it means
Circuit Malfunction: Secondary Air Injection System Relay (B) (J545) Problem with catalyst system cylinder bank-1 (efficiency below threshold) (OBD Code :…
Sign in free to read the full fault guide
- The full plain-language explanation
- Free — just sign in with Google
We only see your name and email. No spam, ever.