What usually causes it
- A failed air pump, relay or fuse
- A stuck or clogged valve or air line
- A cracked or loose hose
- A bad vacuum control solenoid
P0411Starts at: OK to drive, fix when convenient
Air pump (secondary air) flow is wrong
Some cars have an air pump that blows fresh air into the exhaust right after a cold start, to burn leftover fuel. The computer sees that the air flow is not what it expects.
Check this first
Check the fuse and relay for the air pump. Your owner manual shows where they are.
What to watch for
- A loud whine or buzz from the pump on a cold start
- Rough idle on a cold start
- Poor gas mileage
Can I keep driving?
We rate P0411 as OK to drive, fix when convenient, as a starting point. Keep an eye on the signs below. If the light starts flashing, stop driving soon.
Quick answers about P0411
What does P0411 mean?
Air pump (secondary air) flow is wrong. Some cars have an air pump that blows fresh air into the exhaust right after a cold start, to burn leftover fuel. The computer sees that the air flow is not what it expects.
Can I keep driving with P0411?
We rate P0411 as OK to drive, fix when convenient, as a starting point. Keep an eye on the signs below. If the light starts flashing, stop driving soon.
What usually causes P0411?
The most common causes, in order: A failed air pump, relay or fuse; A stuck or clogged valve or air line; A cracked or loose hose; A bad vacuum control solenoid.
Estimates only. A mechanic should confirm. The same code can mean slightly different things on different cars; the app explains it for your exact year, make, model and mileage.