P0412 2003 FORD F150 - Secondary Air Injection System Switching Valve 'A' Circuit Malfunction
P0412 2003 Ford F150 Possible Causes
- Faulty Air Pump inoperative
- Air bypass solenoid harness is open or shorted
- Air bypass solenoid circuit poor electrical connection
P0412 2003 Ford F150 Tech Notes
The PCM attempts to control when air is injected in the exhaust. The DTC indicates a Secondary Air injection system AIR circuit fault.
Cost of diagnosing the P0412 2003 Ford F150 code
The cost of diagnosing the P0412 2003 Ford F150 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected?
The DTC P0412 is detected the the AIR vacuum control solenoid circuit not operating as desired by the PCM.
P0412 2003 Ford F150 Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine hesitation
P0412 2003 Ford F150 Meaning
An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM
) grounds the Air pump relay control circuit which energizes the Air pump. The PCM
also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM
enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.