P0411

Low Severity

Secondary Air Injection System Incorrect Flow

Emissions System

Answer BoxDiagnosis FlowFAQRelated Repairs

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

Check engine light on

Common Causes

Failed air pumppossible
Stuck check valvelikely
Clogged air injection passagespossible
Relay or fuse issuepossible

How to Diagnose P0411

  1. 1Check air pump relay and fuse
  2. 2Listen for air pump on cold start
  3. 3Inspect check valve for sticking
  4. 4Check passages for carbon blockage

OEM Procedures for P0411

P0411 affects the Engine Control Module. Found 146 OEM service manual procedures.

Engine Control Module

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)

Engine Control Module
No link

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)

Engine Control Module
No link

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)

Engine Control Module
No link

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)

Engine Control Module
No link

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)

Engine Control Module
No link

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)

Engine Control Module
No link

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)

Engine Control Module
No link

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)

Engine Control Module
No link

Showing 8 of 146 procedures

OEM Diagnostic Flowchart

Scroll to load technician if/then branches.

Read live data and freeze frame for P0411 to pinpoint the cause before buying parts.

Recommended
TOPDON TopScan

TopScan

$51.27

DIYers who want phone-based scanning

View on TOPDON
TOPDON ArtiLink600

ArtiLink600

$99

DIYers working on ABS/airbag systems

View on TOPDON

Got a repair estimate for P0411? Check if the quote is fair before ordering parts.

Free Quote CheckQuote Shield Pro
Recommended Tools & Savings

Turn This Into a Confident Next Step

Verify the likely fault first, then compare a quote before you approve expensive work.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Diagnostic ToolsFree Quote CheckQuote Shield Pro
View supporting tool options

OBD2 scanner

Read codes and freeze-frame data before you guess at the fault.

Most diagnostic jobs start with a scan tool and a verified code path.

Shop on Amazon →

Battery tester

Check cranking and charging health before replacing expensive parts.

A weak battery can mimic alternator or starter problems.

Shop on Amazon →

Multimeter kit

Confirm voltage, continuity, and sensor power with one simple kit.

A meter is the cheapest way to rule out a bad circuit fast.

Shop on Amazon →

Related Resources

Repair guides, symptom pages, and wiring diagrams related to P0411.

Related Symptoms

Browse →
Check engine light onSymptom Hub

A check-engine light is a graph entry point into code pages, symptom-specific diagnosis, and the exact repair categories most often associated with those failures.

Related Codes

P0401: EGR Insufficient FlowRelated

The EGR is not flowing enough exhaust gas. Usually carbon buildup blocking the passages.

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.

Get the Complete Maintenance Schedule for P0411 drivers

Oil, filters, belts, brakes, and fluid intervals sent to your inbox. Unsubscribe anytime.

Not sure you want to DIY? Compare local shop pricing first.

Get Free Quote CheckDiagnose Another Issue

Author & Review

Written by AllOEMManuals Editorial Team. Reviewed by ASE-certified technicians and updated with factory-reference checks for fitment-sensitive steps.

This guide was drafted with AI assistance and reviewed for accuracy by a human editor.

Last updated: 2026-05-07

Need a diagnosis for your specific vehicle?

Start Free AI Diagnosis →

100% Free — No signup required