Powertrain (Engine & Gearbox)Standard EOBD

P0413 - Secondary Air Injection System Switching Valve 'A' Circuit Open

Q: What are the symptoms of fault code P0413?

• Check Engine Light (MIL) illuminated • Failed emissions test • Slightly higher emissions during cold start phase • Typically no noticeable driveability issues

Q: What causes fault code P0413?

• Most likely: Faulty secondary air injection switching valve (internal open coil) • Likely: Damaged wiring or corroded connectors leading to the valve • Possible: Blown fuse for the AIR system circuit • Rare: Internal Engine Control Unit (ECU) failure

Q: How do you fix fault code P0413?

STEP 1: Visually inspect the connector at the switching valve for corrosion or backed-out pins. Check the relevant AIR system fuses. STEP 2: Disconnect the valve and measure resistance (Ohms) across the solenoid terminals. Normal values are typically 20–50 Ohms. If the meter reads 'OL' or infinite, replace the valve. STEP 3: Use a scan tool to command the valve 'ON' and verify 12V power and ground at the connector. STEP 4: If the internal coil is confirmed open, replace the switching valve and clear the DTC.

Last updated:1 February 2026

Related:Secondary Air Valve, AIR Pump, Wiring, ECU, Fuse

System

Powertrain (Engine & Gearbox)

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Technical Description

P0413 is a generic diagnostic trouble code (DTC) indicating an 'open circuit' in the secondary air injection (AIR) system switching valve 'A'. The AIR system functions by injecting fresh air into the exhaust stream during cold starts to accelerate catalytic converter lighting and reduce emissions (HC and CO). The ECU monitors the circuit's integrity; if it detects an infinite resistance (interrupted path) when the solenoid is commanded, P0413 is triggered. This code is specifically related to electrical continuity and not system air flow.

Possible Causes

Faulty secondary air injection switching valve (internal open coil)

Damaged wiring or corroded connectors leading to the valve

Blown fuse for the AIR system circuit

Internal Engine Control Unit (ECU) failure

Symptoms

Check Engine Light (MIL) illuminated

Failed emissions test

Slightly higher emissions during cold start phase VIDA.

Typically no noticeable driveability issues

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P0413 - Secondary Air Injection System Switching Valve 'A' Circuit Open

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P0413 - Secondary Air Injection System Switching Valve 'A' Circuit Open

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