Wiring fault on the monitor circuit, such as chafing, short to earth or a damaged harness; Corroded, loose or water-damaged connector at the monitor sensor, pump or control module; Faulty secondary air system monitor sensor (the type and location depend on the model and engine); Failed air pump, or a faulty relay or switching valve affecting the monitor signal; Blown fuse or a fault in the power or earth supply to the air injection system; Internal fault in the powertrain control module.

P1413

Secondary Air Injection System Monitor Circuit Low Voltage.

Mercury
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
4: AreaAuxiliary emission controls
13: FaultThe specific fault in that area

What it means

P1413 on a Mercury means the powertrain control module has detected a low voltage on the Secondary Air Injection (AIR) system monitor circuit. Mercury shares this definition with Ford. The module saw the monitor signal sit below its expected range, so it cannot confirm the secondary air system is working, and it stores the code and usually turns on the engine warning light.

Symptoms

Engine warning light on
Secondary air system monitor will not complete, so an emissions test may fail
Usually no change in driveability
Possible rough idle or slightly higher emissions on a cold start if the air system is not working
Whining or no noise from the air pump at cold start, depending on the fault

Possible causes

Wiring fault on the monitor circuit, such as chafing, short to earth or a damaged harnesslikely
Corroded, loose or water-damaged connector at the monitor sensor, pump or control modulelikely
Faulty secondary air system monitor sensor (the type and location depend on the model and engine)possible
Failed air pump, or a faulty relay or switching valve affecting the monitor signalpossible
Blown fuse or a fault in the power or earth supply to the air injection systempossible
Internal fault in the powertrain control modulerare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including engine temperature and conditions when the code set
Look up the wiring diagram for your model and engine, since the monitor circuit layout and component positions vary
Visually inspect the air injection pump, relay, valves, hoses and wiring for damage, water ingress, corrosion or rodent damage
Check the relevant fuses and the relay, and check the power and earth supplies at the air pump
Disconnect and inspect connectors at the monitor sensor and control module for corrosion, bent pins or poor tension
Measure the monitor circuit voltage against the manufacturer's specification, and check the wiring for a short to earth
Command the air pump and valves on with a suitable scan tool, if supported, and check for correct operation and airflow
Clear the code and road test, then confirm the monitor runs and the code does not return

How to fix

Repair or replace damaged wiring and secure the harness away from heat and sharp edges
Clean or replace corroded or damaged connectors and terminals
Replace a faulty monitor sensor, as specified for the model
Replace a failed air pump, relay or switching valve
Replace blown fuses once the cause of the overload is found and fixed
Repair or replace the control module only after all other causes have been ruled out

Can I keep driving?

Low severity

The car can normally be driven as the fault mainly affects emissions monitoring. Book it in soon, as the warning light may mask other faults and the car may fail an emissions test.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.