AutoCodes – Lincoln – P2099 Lincoln

P2099 Lincoln Code - Post Catalyst Fuel Trim System Too Rich Bank 2

Quick Answer

The Powertrain Control Module (PCM) monitors the correction value from downstream Heated Oxygen Sensor (HO2S) as part of the fore-aft oxygen sensor control routine. Common causes include Faulty Heated Oxygen Sensor, Heated Oxygen Sensor harness is open or shorted, Heated Oxygen Sensor circuit poor electrical connection. 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: P2099 Lincoln indicates Post Catalyst Fuel Trim System Too Rich Bank 2.
Common causes: Common causes include Faulty Heated Oxygen Sensor, Heated Oxygen Sensor harness is open or shorted, Heated Oxygen Sensor circuit poor electrical connection.
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 1,908

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P2099 Lincoln Description

The Powertrain Control Module (PCM) monitors the correction value from downstream Heated Oxygen Sensor (HO2S) as part of the fore-aft oxygen sensor control routine. The test fails when correction value is greater than a calibrated limit.

OBDII Code P2099 Lincoln - Post Catalyst Fuel Trim System Too Rich Bank 2 - AutoCodes.com — P2099 Lincoln Code - Post Catalyst Fuel Trim System Too Rich Bank 2

What does this mean?

What are the Possible Causes of the DTC P2099 Lincoln?

Faulty Heated Oxygen Sensor
Heated Oxygen Sensor harness is open or shorted
Heated Oxygen Sensor circuit poor electrical connection
Exhaust leaks
Contaminated Heated Oxygen Sensor

How to Fix the DTC P2099 Lincoln?

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 does this mean?

Code Tech Notes

Before replacing the Heated Oxygen Sensor, inspect the sensor connector for signs of damage, water ingress, or corrosion

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2099 Lincoln 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.