AutoCodes – Generic – P2098

P2098 Code - Post Catalyst Fuel Trim System Too Lean Bank 2

Quick Answer

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. 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: P2098 indicates Post Catalyst Fuel Trim System Too Lean 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 22,979

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 Nov 25, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P2098 Description

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. The control module supplies the HO2S with a reference, or bias voltage of about 450 mV. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1,000 mV. This voltage will fluctuate above and below the bias voltage. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases above bias voltage toward 1,000 mV indicates a rich fuel mixture. An HO2S voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture.
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the control module to calculate the air-to-fuel ratio sooner.
Fuel trim bias is used by the Engine Control Module (ECM) to keep the post catalyst HO2S voltage within a range of 580-665 mV. This allows optimal catalyst efficiency under light load conditions, such as at idle or a steady cruise. The ECM constantly monitors how lean or rich the fuel trim bias is commanded, to determine if the fuel trim bias is greater than a calibrated amount.
The Diagnostic Trouble Code (DTC) will set if the post catalyst fuel trim correction factor is biased lean by more than 8 percent of the HO2S signal value for more than 4 seconds or for a cumulative of 50 seconds.

OBDII Code P2098 - Post Catalyst Fuel Trim System Too Lean Bank 2 - AutoCodes.com — P2098 Code - Post Catalyst Fuel Trim System Too Lean Bank 2

What does this mean?

What are the Possible Causes of the DTC P2098?

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 P2098?

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 P2098 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.

Need more information about the P2098 code?

Need more information on how to fix the P2098 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2098 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P2098 Audi — Post Catalyst Fuel Trim System Bank 2 Too Lean
P2098 BMW — Oxygen Sensor Before Catalytic Converter 2 Trim Control
P2098 Buick — Post Catalyst Fuel Trim System Low Limit Bank 2
P2098 Cadillac — Post Catalyst Fuel Trim System Low Limit Bank 2
P2098 Chevrolet — Post Catalyst Fuel Trim System Low Limit Bank 2
P2098 Chrysler — Downstream Fuel Trim System 2 Lean
P2098 Dodge — Downstream Fuel Trim System 2 Lean
P2098 Ford — Post Catalyst Fuel Trim System Too Lean Bank 2
P2098 GMC — Post Catalyst Fuel Trim System Low Limit Bank 2
P2098 Hyundai — Post Catalyst Fuel Trim System Too Lean Bank 2
P2098 Jeep — Downstream Fuel Trim System 2 Lean
P2098 KIA — Post Catalyst Fuel Trim System Too Lean Bank 2
P2098 Land Rover — Post Catalyst Fuel Trim System Too Lean Bank 2
P2098 Lincoln — Post Catalyst Fuel Trim System Too Lean Bank 2
P2098 Mazda — Target AF Feedback System Too Lean Left Bank
P2098 Mercury — Post Catalyst Fuel Trim System Too Lean Bank 2
P2098 MINI — Oxygen Sensor Before Catalytic Converter 2 Trim Control
P2098 Mitsubishi — Downstream Fuel Trim System 2 Lean
P2098 RAM — Downstream Fuel Trim System 2 Lean
P2098 Subaru — Post Catalyst Fuel Trim System Too Lean Bank 2
P2098 Suzuki — Post Catalyst Fuel Trim System Low Limit Bank 2
P2098 Volkswagen — Post Catalyst Fuel Trim System Bank 2 Too Lean

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.

Frequently Asked Questions about P2098 Code

1. What are common symptoms of OBDII code P2098?

- Common symptoms include poor fuel economy, rough idle, engine stalling, and the Check Engine light turning on.

2. What does the OBDII code P2098 indicate?

- The code P2098 indicates that the post-catalyst fuel trim system on bank 2 is reading a lean condition, meaning there is too much air and not enough fuel in the exhaust gases.

3. What are possible causes of OBDII code P2098?

- Possible causes include a faulty oxygen sensor, fuel pressure issues, vacuum leaks, exhaust system leaks, or a problem with the fuel injectors.

4. How can I diagnose the cause of OBDII code P2098?

- Diagnosing the issue involves performing a thorough inspection of the oxygen sensors, checking for vacuum leaks, testing fuel pressure, inspecting the exhaust system, and scanning for other related trouble codes.

5. Can driving with an unresolved P2098 code cause further damage?

- Continuing to drive with a P2098 code can potentially lead to damage to the catalytic converter, as the engine may run inefficiently and produce harmful emissions.

6. What are some repair tips for resolving OBDII code P2098?

- Repair tips include replacing faulty oxygen sensors, fixing vacuum leaks, addressing fuel pressure issues, inspecting and repairing exhaust system leaks, and cleaning or replacing fuel injectors.

7. How much does it typically cost to repair OBDII code P2098?

- The cost of repairing P2098 can vary depending on the root cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can I reset the Check Engine light after fixing OBDII code P2098?

- After fixing the issue causing the P2098 code, you can reset the Check Engine light using an OBDII scanner or by disconnecting the car's battery for a few minutes.

9. How can I prevent OBDII code P2098 from recurring in the future?

- To prevent the recurrence of P2098, it's important to perform regular maintenance on your vehicle, address any engine performance issues promptly, and use quality fuel and oil products.

10. Is it safe to drive my vehicle with a P2098 code if it's running fine?

- While it may be safe to drive in the short term if the vehicle is running fine, it's recommended to address the underlying issue causing the P2098 code to prevent potential long-term damage and ensure optimal engine performance.