AutoCodes – Mercury – P219B Mercury

P219B Mercury Code - Bank 2 Air/Fuel Ratio Imbalance

Quick Answer

The air fuel imbalance monitor is designed to detect differences in the air fuel ratio between cylinders per engine bank. Common causes include Leaking or contaminated fuel injectors, Low fuel pressure or running out of fuel, Leaking evaporative emission (EVAP) canister purge valve. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P219B Mercury indicates Bank 2 Air/Fuel Ratio Imbalance.
Common causes: Common causes include Leaking or contaminated fuel injectors, Low fuel pressure or running out of fuel, Leaking evaporative emission (EVAP) canister purge valve.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,075

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 12, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P219B Mercury Description

The air fuel imbalance monitor is designed to detect differences in the air fuel ratio between cylinders per engine bank. The test fails if the air fuel ratio difference per cylinder is greater than a calculated amount.

OBDII Code P219B Mercury - Bank 2 Air/Fuel Ratio Imbalance - AutoCodes.com — P219B Mercury Code - Bank 2 Air/Fuel Ratio Imbalance

What does this mean?

What are the Possible Causes of the DTC P219B Mercury?

Leaking or contaminated fuel injectors
Low fuel pressure or running out of fuel
Leaking evaporative emission (EVAP) canister purge valve
Exhaust or intake air system leaks
Exhaust gas recirculation (EGR) system
Positive crankcase ventilation (PCV) system is leaking or the valve is stuck open
Ignition system
Incorrectly seated engine oil dipstick, tube or oil fill cap

How to Fix the DTC P219B 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 P219B 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.