P0410 to P0419, P0491 and P0492: secondary air injection
The system that pumps fresh air into the exhaust during a cold start has a general fault, a wrong or insufficient air flow on bank 1 or bank 2, or a circuit fault on a switching valve (A or B) or its pump control relay.
SeverityModerateUsually not urgent today, but it can get worse if left.
Can you keep driving?Drive gently, check it soonWhat does P0410 mean?
In the first minute or two after a cold start, some petrol engines blow fresh air into the exhaust ports with an electric pump. The extra oxygen burns the unburnt fuel of the rich cold mixture and heats the catalytic converter quickly. Valves keep exhaust out of the pump when it is off. If the pump, the valves or the passages fail, emissions rise in that first minute, but the engine itself runs normally afterwards.
What causes P0410?
- A failed air pump, often seized by water that got into it
- A stuck or leaking check valve or switching valve
- Carbon blocking the air passages into the cylinder head
- A failed pump relay or a blown fuse
- A split hose or a damaged vacuum line to the switching valve
What to check first for P0410
- Listen for the pump running for about a minute after a cold start
- Check the pump relay and fuse
- Inspect the hoses and the check valve for damage and soot, which shows exhaust getting back
- Have the pump and valves commanded with a scan tool while the oxygen sensor readings are watched
Can you drive with P0410?
You can drive to a workshop. The car may fail an emissions test; if the pump runs constantly or makes a loud grinding noise, have it looked at soon, because a seized pump can blow its fuse and stop other functions.
Clear a code only after the fault is fixed. A code that comes back means the cause is still there, and a warning light left on can hide a second fault behind the first.
Codes on this page
12
- P0410Secondary Air Injection System
- P0411Secondary Air Injection System Incorrect Flow Detected
- P0412Secondary Air Injection System Switching Valve "A" Circuit
- P0413Secondary Air Injection System Switching Valve "A" Circuit Open
- P0414Secondary Air Injection System Switching Valve "A" Circuit Shorted
- P0415Secondary Air Injection System Switching Valve "B" Circuit
- P0416Secondary Air Injection System Switching Valve "B" Circuit Open
- P0417Secondary Air Injection System Switching Valve "B" Circuit Shorted
- P0418Secondary Air Injection System Control "A" Circuit
- P0419Secondary Air Injection System Control "B" Circuit
- P0491Secondary Air Injection System Insufficient FlowBank 1
- P0492Secondary Air Injection System Insufficient FlowBank 2
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
