AutoCodes – Mercury – P1411 Mercury

P1411 Mercury Code - Secondary Air Injection Downstream Flow

Quick Answer

Secondary Air Injection Downstream (AIR) Flow. Common causes include Faulty Secondary Air Injection Downstream (AIR) pump, Hose off or blocked, Bypass solenoid stuck open/closed. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P1411 Mercury indicates Secondary Air Injection Downstream Flow.
Common causes: Common causes include Faulty Secondary Air Injection Downstream (AIR) pump, Hose off or blocked, Bypass solenoid stuck open/closed.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 1,362

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1411 Mercury Description

Secondary Air Injection Downstream (AIR) Flow. The secondary air injection system does not detect the presence of air in the exhaust when introduced by the secondary air injection system Electric AIR Pump Hose from AIR pump leak AIR bypass solenoid leak/blocked Hose from AIR pump blocked AIR bypass solenoid stuck open/closed In order to test the AIR pump, it must be capable of driving the HO2S lean.

OBDII Code P1411 Mercury - Secondary Air Injection Downstream Flow - AutoCodes.com — P1411 Mercury Code - Secondary Air Injection Downstream Flow

What does this mean?

What are the Possible Causes of the DTC P1411 Mercury?

Faulty Secondary Air Injection Downstream (AIR) pump
Hose off or blocked
Bypass solenoid stuck open/closed

How to Fix the DTC P1411 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1411 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.