P0411
Low SeveritySecondary Air Injection System Incorrect Flow
Emissions System
P0411 — Instant Answer
Secondary Air Injection System Incorrect Flow
Severity: LOW SEVERITY
Meaning: The secondary air injection system is not flowing properly. This system pumps fresh air into the exhaust on cold starts to help the cat warm up.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $30 - $300
Most common causes:
- 1. Failed air pump (10-25% of cases)
- 2. Stuck check valve (35-45% of cases)
- 3. Clogged air injection passages (10-25% of cases)
- 4. Relay or fuse issue (10-25% of cases)
Symptoms
- ⚠️Check engine light
- ⚠️Failed emissions test
- ⚠️Slight noise from air pump on cold start
Related Symptoms
Common Causes
How to Diagnose P0411
- 1Check air pump relay and fuse
- 2Listen for air pump on cold start
- 3Inspect check valve for sticking
- 4Check passages for carbon blockage
OEM Procedures for P0411
P0411 affects the Engine Control Module. Found 146 OEM service manual procedures.
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
12 90 120 Removing and installing/replacing control unit bracket (Cooper 4-door hatchback, Cooper 2-door hatchback, 2020-2023) - Replacement: Remount DME control unit and the integrated supply module (PDM)
Showing 8 of 146 procedures
OEM Diagnostic Flowchart
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Parts & Tools for This Job
Common parts shoppers buy for P0411 Secondary Air Injection System Incorrect Flow.
Oxygen Sensor
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Catalytic Converter
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EVAP Purge Valve
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Gas Cap
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OBD2 scanner
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Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
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A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsRelated Resources
Repair guides, symptom pages, and wiring diagrams related to P0411.
OEM Manual Evidence
Browse →A L L Diagnostic Trouble Codes ( DTC ) — 2013 Buick LaCrosse AWD V6-3.6L Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Rei...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 Buick LaCrosse FWD L4-2.4L Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Rei...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 Buick LaCrosse FWD V6-3.6L Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Rei...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 Chevrolet Cruze L4-1.8L Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimag...
Related Symptoms
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Open the exact vehicle hub grounded by OEM manual evidence related to P0411.
Open the exact vehicle hub grounded by OEM manual evidence related to P0411.
Open the exact vehicle hub grounded by OEM manual evidence related to P0411.
Frequently Asked Questions
- What is secondary air injection?
- It pumps fresh air into the exhaust manifold on cold starts to help the catalytic converter reach operating temperature faster.
- Is P0411 expensive to fix?
- The check valve is cheap ($30-$50). If the air pump has failed, it can be $150-$300 for the pump.
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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-11-01