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1999 Mustang V6 P1413 Code: Secondary Air Injection System Low Voltage - Diagnosis and Fuel Consumption Issue

Model: 99 Mustang V6 Fault Code: P1413 Posted: 2007-10-31 09:09

I recently received a diagnostic code P1413 on my 1999 Mustang V6, which indicates a 'Secondary Air Injection System Monitor Circuit Low Voltage' fault. While the car runs smoothly, I'm noticing unusually high fuel consumption—approximately one-quarter of a tank is being used in just 10 miles. I'd like to understand what this code means and which components should be inspected. Could this issue be directly related to the air injection system or are there other potential causes for such severe fuel burning? Any insights would be greatly appreciated.

Related fault codes
P1413
Comments (3)
Anonymous 2007-10-31 09:36

The 1999 Mustang V6 is equipped with an electric secondary air pump and associated valves, controlled by the Powertrain Control Module (PCM). These components are typically protected by fuses and relays. Refer to your owner's manual to locate these parts and verify their functionality. However, a low-voltage fault in this system should not result in such extreme fuel consumption—unless there are other underlying issues affecting the PCM or fuel delivery.

Anonymous 2007-10-31 13:14

No, the 1999 Mustang V6 does not have a mechanical air pump. It uses an electric secondary air pump that is controlled by the PCM and operates through dedicated fuses, relays, and wiring harnesses.

Anonymous 2007-10-31 20:07

The P1413 code points to a low voltage issue in the secondary air injection system circuit. This component is typically managed via fuses, relays, and wiring as outlined in the owner's manual. While this fault may indicate a wiring or sensor problem, it should not directly cause fuel consumption at the rate of one-quarter of a tank over 10 miles. Such high fuel burn would suggest other issues—such as a malfunctioning fuel pump, faulty injectors, or an incorrect fuel pressure setting—possibly related to PCM mismanagement. A raw fuel leak from the exhaust is required for such extreme consumption, unless the vehicle is being fueled with a large-capacity container like a 1-gallon gerry can.