Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2007FOCUS SES, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - POWERTRAIN DTC CHARTS AND DESCRIPTIONS (EXCEPT DIESEL & HYBRID)DTC DIAGNOSISP0412 - SECONDARY AIR INJECTION (AIR) SYSTEM - SWITCHING VALVE A CIRCUIT
2007 Ford Focus SES, 4D Sedan, Standard
P0412 - Secondary Air Injection (Air) System - Switching Valve A Circuit
2007 Ford Focus SES, 4D Sedan, StandardSECTION P0412 - Secondary Air Injection (Air) System - Switching Valve A Circuit
P0412 - SECONDARY AIR INJECTION (AIR) SYSTEM - SWITCHING VALVE A CIRCUIT
| Description: | On the primary side of the AIR relay, open and short faults on the AIR command circuit are detected during normal operation by the powertrain control module (PCM) output driver. | |||
| Possible Causes: |
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| Diagnostic Aids: | For intermittent faults use the AIR PCM output driver fault PID (AIRF) during a harness wiggle test with the AIR PCM output driver in OFF and ON states. The AIR PCM output driver fault PID AIRF instantly detects open circuits and shorts to ground with the PCM output driver off. The AIR PCM output driver fault PID AIRF instantly detects open circuits and shorts to ground with the PCM output driver off. The AIR PCM output driver fault PID AIRF instantly detects a short to voltage or low resistance load with the PCM output driver on. Use the output test mode to toggle the PCM output driver from OFF to ON. Refer toOUTPUT TEST MODE (OTM) . |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory | |
| All | refer to PINPOINT TEST HM . | |||
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.