P0419 — Secondary Air Injection System Relay "A" Circuit Malfunction
Can drive — fix at your convenience.
What P0419 means
This code means the engine computer detected a problem in the control circuit for the secondary air injection system relay 'A'. This relay switches power to the air pump and related components used to lower emissions during cold starts. Fixes usually involve replacing the relay, repairing wiring or connectors, and the work is generally inexpensive.
Common symptoms
- Check engine light is on
- No noticeable change in how the car drives
- Failed emissions or smog test
- Air injection pump may not run at startup
- Slightly higher cold-start emissions
Common causes
- Faulty secondary air injection relay
- Corroded or damaged wiring to the relay
- Loose or corroded relay connector or socket
- Blown fuse in the relay circuit
- Problem with the engine control module driver
Typical repair cost
$100 – $400
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0419 code?
Yes, it's generally safe to keep driving. The relay only powers the cold-start emissions system, so your car performs normally. Get it repaired before an emissions test.
How much does it cost to fix a P0419 code?
Typically around $100 to $400. The relay itself is often inexpensive, so cost mostly depends on labor and whether wiring repairs are needed.
Is a P0419 code serious?
No, it's a low-severity emissions code. It won't damage the engine or strand you, but it keeps the check engine light on and can cause an emissions failure.
What does the secondary air injection relay do?
It acts as an electrical switch that turns on the air injection pump and valves during cold starts. When the relay or its circuit fails, the system can't run and the computer sets this code.