Fault code P0413 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0413 – Secondary Air Injection System Switching Valve A Circuit Open

P0413: Causes, signs and repairs

Error code P0413 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the secondary air system switching valve (bank 1). This DTC P0413 indicates a problem with the switching valve that controls the air flow to the exhaust system. The trouble code may have slightly different names for different manufacturers, but it always relates to the secondary air system.

What causes can this error code have?

Defective secondary air system switching valve
Damaged or corroded wiring to the switching valve
Loose or corroded plug connections
Defective secondary air pump
Blocked or damaged air lines
Faulty engine control unit software
Blown fuse in the secondary air system
Vacuum leak in the switching valve system

What symptoms occur in parallel with fault code P0413?

Starting problems: The vehicle is more difficult to start in cold temperatures
Increased emissions: Poorer exhaust emissions, especially when the engine is cold
Uneven engine running: Engine runs unevenly during the warm-up phase
Check engine light: Permanently lit or flashing warning light
Knocking noises: Unusual noises from the engine compartment when starting
Loss of power: Reduced engine power in the first few minutes after starting

How can the problem with fault code P0413 be rectified?

Repairing fault code P0413 requires a systematic diagnosis of the secondary air system.
Replace the secondary air system switching valve completely and check the electrical connections
Check the wiring to the switching valve for damage and replace defective cables
Clean plug connections, check for corrosion and replace if necessary
Test secondary air pump and have it completely replaced if defective
Check air lines for blockages or cracks and replace damaged parts
Check fuses in the secondary air system and replace blown fuses
Check vacuum lines for leaks and seal leaks or replace lines
Update engine control unit software or have control unit replaced if defective

FAQ - Frequently asked questions about DTC P0413

Can I continue driving with error code P0413?

Yes, it is possible to drive in the short term, but the emission values will deteriorate considerably. The vehicle will fail the next emissions test. A prompt repair is therefore recommended.

How much does it cost to repair error code P0413?

The costs vary between 150-800 euros depending on the cause. A defective shift valve costs around 150-300 euros, while replacing the secondary air pump can cost 400-800 euros.

How can I diagnose fault code P0413 myself?

You can read out the code using an OBD scanner. First check the fuses and plug connections. However, specialist tools and experience are required for further diagnostics.

Is error code P0413 a common problem?

Yes, this EOBD code occurs more frequently, especially in vehicles with higher mileage (over 100,000 km), as the secondary air system is subject to mechanical stress.

Can cold weather trigger error code P0413?

Yes, the secondary air system works more intensively in very cold temperatures, which can cause already weakened components to fail. The code then occurs more frequently in winter.

Does the error code P0413 disappear by itself?

No, this code does not disappear by itself, as it indicates a mechanical or electrical fault. Without repair, the problem will persist and the check engine light will remain illuminated.

Vehicles in which error code P0413 occurs most frequently

Error code P0413 is a standardized OBD-II trouble code that indicates problems with the secondary air system switching valve and can occur in various vehicle brands, but is most common in the following vehicles:

BMW: 3 Series E46, 5 Series E39, X3 E83, X5 E53 (1998-2008)
Mercedes-Benz: C-Class W203, E-Class W211, ML-Class W163 (2000-2009)
Audi: A4 B6/B7, A6 C5/C6, Q7 4L (1997-2010)
Volkswagen: Golf IV/V, Passat B5/B6, Touareg 7L (1998-2010)
Ford: Focus II, Mondeo III/IV, S-Max (2004-2012)
Opel: Astra H, Vectra C, Zafira B (2004-2011)
Toyota: Avensis T25, RAV4 XA20, Prius XW20 (2003-2012)
Nissan: Primera P12, X-Trail T30, Qashqai J10 (2002-2013)
If code P0413 occurs in your vehicle, you should first have the fuses and plug connections of the secondary air system checked. As this system is particularly susceptible to wear in older vehicles, professional diagnosis at a specialist workshop is recommended. Timely repair not only prevents failing the emissions test, but also possible consequential damage to the engine or catalytic converter.

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