Secondary Air System and Circuit Faults (14 codes)

What these codes mean

P0410 is a secondary-air system condition and P0411 an incorrect-flow condition. P0412/P0413/P0414 retain valve A circuit, open and shorted distinctions; P0415/P0416/P0417 retain those distinctions for valve B. P0418/P0419 identify system control A/B circuits. Related codes help choose the tests; they do not automatically identify one failed pump or prove a contaminated system. P2257/P2258 add low/high conditions for control A, and P2259/P2260 add low/high conditions for B. Keep system, flow, valve and control-circuit results distinct when several are stored.

Secondary air supplies air to the exhaust for emissions control, commonly during catalyst warm-up. The engine determines its operating window, test prerequisites and supported output commands. Do not assume that every system runs only for one fixed number of seconds or permits exactly one test per overnight soak. Ask the workshop whether it needs the vehicle presented cold.

Distinguish electrical control from air delivery. The cited Touareg CGFA table uses a pressure-based system response and separate valve/control monitors. A pump sound or valve click cannot establish adequate air delivery. GM 17-NA-080 documents diagnosed head-port restriction on its listed 2013–2014 2.5L LCV/LKW applications; that demonstrates a possible flow fault without authorizing passage cleaning on every vehicle.

Identify A/B using the full code and engine diagram. A valve label does not universally identify a cylinder bank, and a system-control label does not guarantee a removable relay. Toyota’s cited 2UZ-FE bulletin distinguishes valve, pump and electronic control-driver checks on a defined model/year list. The Audi R8/Spyder example maps control circuits to banks in its own section. Neither example establishes another vehicle’s pins, driver polarity or serviceable components.

The March 2013 Audi 6.3L CEJA tables give a specific low/high example: P2257/P2259 use low-voltage criteria for A/B, while P2258/P2260 use high-current criteria. A generic high label is therefore not a universal voltage threshold or proof of an open wire. Match the controller, complete code and diagnostic state. The letters do not establish two pumps, independent wiring or a healthy shared supply when only one output has a code.

Have the specified supply, return, command and load checks performed under the correct conditions. A static coil reading does not certify an electronic assembly or the rest of its circuit. Keep the exhaust cool during access; never use an ohmmeter on a powered circuit, bridge unknown relay sockets or put an ordinary handheld current input in a high-current pump supply. Investigate a fuse failure instead of fitting a larger fuse.

Confirm the actual repair and repeat the required functional/monitor checks. The national air-pump replacement price covers a confirmed pump job; it does not price a valve, driver, harness or cylinder-head passage repair. Diagnostic labor is separate. Arrange prompt attention for smoke, burning smells, melted wiring, an overheating component, abnormal continuous pump operation or serious running problems. The code alone does not provide driving clearance.