P0414
Secondary Air Injection System Switching Valve "A" Circuit Shorted
- Severity
- Low
- Driving
- Drivable — book it in
The circuit for secondary air injection switching valve "A" is shorted. Depending on where the short is, the valve may be held open, held closed, or simply uncontrollable. A valve held open lets air into the exhaust continuously, which has consequences beyond the emissions system.
Possible causes
- CommonShorted winding in the valve solenoid
- CommonChafed wiring shorting against the engine or exhaust heat shield
- CommonCorroded connector bridging pins
- PossibleWater ingress into the connector
- RareFailed control module driver
What you might notice
- Check engine light on
- Failed emissions test
- Blown fuse, sometimes repeatedly
- Worse fuel economy if the valve is being held open
- Rough running in some conditions
What to check, in order
- Disconnect the valve and check whether the short persists at the harness. If it does, the fault is in the wiring rather than the valve.
- Measure the valve winding resistance against specification.
- Inspect the harness where it passes near the exhaust or a heat shield - this is the most common place for a short on this circuit.
- Inspect the connector for corrosion bridging pins.
- If a fuse keeps blowing, find the short before fitting another one.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Auxiliary emission controls
P0400P0401P0402P0403P0404P0405P0406P0407P0408P0409P0410P0411P0412P0413P0414P0415P0416P0417P0418P0419P0420P0421P0422P0423P0424P0425P0426P0427P0428P0429P0430P0431P0432P0433P0434P0435P0436P0437P0438P0439P0440P0441P0442P0443P0444P0445P0446P0447P0448P0449P0450P0451P0452P0453P0454P0455P0456P0457P0458P0459P0460P0461P0462P0463P0464P0465P0466P0467P0468P0469P0470P0471P0472P0473P0474P0475P0476P0477P0478P0479P0480P0481P0482P0483P0484P0485P0486P0487P0488P0489P0490P0491P0492P0493P0494P0495P0496P0497P0498P0499