OBD-II code · Powertrain (generic)
P0414 Secondary Air Injection System Switching Valve "A" Circuit Shorted
The ECU detected a short circuit in the secondary air injection switching valve A control circuit. With the valve unable to switch correctly, the cold-start emissions strategy fails and the catalyst takes longer to reach light-off.
Is it safe to drive with P0414?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySwitching valve circuit shorted
- PossibleWiring or connector fault
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Secondary Air Valve, Secondary Air Wiring
Related codes
- P0411Secondary Air Injection System Incorrect Flow
- P0412Secondary Air Injection System Switching Valve A Circuit
- P0413Secondary Air Injection System Switching Valve A Circuit Open
- 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
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.