Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P0411INCORRECT UPSTREAM AIR FLOW DETECTED
P0411SECONDARY AIR SYSTEM INCORRECT FLOW DETECTED - STORED IN MEMORY
Manufacturer communications
18Original wording in English
JAGUAR
JAGUAR: ENGINE MIL ILLUMINATION. ON CERTAIN MODEL VEHICLES EQUIPPED WITH THE 4.2L V8 ENGINE ONLY, THE ENGINE MALFUNCTION INDICATOR LAMP (MIL) MAY BE ILLUMINATED WITH DIAGNOSTIC TROUBLE CODE (DTC) P0411 STORED IN THE ENGINE CONTROL MODULE (ECM). ON BOARD DIAGNOSTIC STRATEGY MAY EXPERIENCE A FALSE DETECTION OF SECONDARY AIR INJECT…
JAGUAR
JAGUAR: MALFUNCTION INDICATOR LAMP ILLUMINATION. ON CERTAIN VEHICLES EQUIPPED WITH 4.2L V8 ENGINE ONLY, THE ENGINE MALFUNCTION INDICATOR LAMP (MIL) MAY BE ILLUMINATED WITH DIAGNOSTIC TROUBLE CODE (DTC) P0411 STORED IN THE ENGINE CONTROL MODULE. *PE
CHEVROLET, GMC, HUMMER, SAAB
GMC: INTERMITTENT SES LIGHT DUE TO DTCS P013B AND/OR P0411 DTC. *PE
AUDI
MIL ON (DTC'S P0300, P0411, P1128, P1130, P1411, P1423). THIS COULD BE CAUSED BY A CRACKED OR BROKEN VACUUM HOSE. *KB
Check vehicle applicability
33A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Secondary Air Injection System Incorrect Flow Detected
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.