P0414 — Secondary Air Injection System Switching Valve A Circuit Open
Drive with caution — fix soon.
What P0414 means
This code means the engine computer detected an open (broken) circuit in the control wiring for the secondary air injection switching valve 'A', so the valve isn't getting its electrical signal. It usually points to broken or corroded wiring, a bad connector, or a faulty switching valve. It's a fairly common code and is typically fixable without major engine work.
Common symptoms
- Check engine light is on
- Rough idle shortly after a cold start
- Air pump may not run or sounds abnormal at startup
- Will likely fail an emissions test
- Little to no change in everyday driving
Common causes
- Broken or open wiring in the valve control circuit
- Corroded or loose connector at the switching valve
- Faulty secondary air switching valve (A)
- Failed control relay for the switching valve
- Loss of power or ground to the valve circuit
Typical repair cost
$150 – $600
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0414 code?
Usually yes, since the switching valve mostly affects cold-start emissions, not everyday driveability. The car stays safe to drive, but it will likely fail an emissions test, so plan to have the wiring and valve checked.
How much does it cost to fix a P0414?
Most repairs run between about $150 and $600. Repairing broken wiring or a connector is cheaper, while replacing the secondary air switching valve raises the cost.
Is a P0414 code serious?
It's not a safety emergency and rarely leaves you stranded, but it means part of your emissions system is offline. It should be fixed so the car passes emissions and burns cleaner on cold starts.
What does switching valve A circuit open mean in P0414?
An 'open circuit' means the electrical path to the air switching valve 'A' is broken, so it isn't getting a signal. This usually points to broken wiring, a bad connector, or a failed valve rather than an engine problem.