AutoCodes – Hyundai – P1123 Hyundai

P1123 Hyundai Code - Long Term Fuel Trim Error System Rich

Quick Answer

P1123 Hyundai indicates Long Term Fuel Trim Error System Rich. Common causes include Leaking pressure regulator or fuel injector, Engine mechanical condition, Faulty HO2S. 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: P1123 Hyundai indicates Long Term Fuel Trim Error System Rich.
Common causes: Common causes include Leaking pressure regulator or fuel injector, Engine mechanical condition, Faulty HO2S.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 30,215

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 Apr 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1123 Hyundai Description

OBDII Code P1123 Hyundai - Long Term Fuel Trim Error System Rich - AutoCodes.com — P1123 Hyundai Code - Long Term Fuel Trim Error System Rich

What does this mean?

What are the Possible Causes of the DTC P1123 Hyundai?

Leaking pressure regulator or fuel injector
Engine mechanical condition
Faulty HO2S

How to Fix the DTC P1123 Hyundai?

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 P1123 Hyundai 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 P1123 Hyundai code?

Need more information on how to fix the P1123 Hyundai code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1123 Hyundai code diagnosed by a professional: Find a repair shop in your area

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 P1123 Hyundai Code

1. What are the common symptoms of OBDII code P1123 Hyundai (Long Term Fuel Trim Error System Rich)?

- Common symptoms include poor fuel economy, rough idling, engine misfires, and a noticeable decrease in overall performance.

2. What causes the OBDII code P1123 Hyundai to trigger?

- The code is typically triggered by a problem with the fuel system, such as a faulty oxygen sensor, fuel injector issues, vacuum leaks, or a malfunctioning mass airflow sensor.

3. How can I diagnose the OBDII code P1123 Hyundai?

- To diagnose the code, you can use an OBDII scanner to retrieve the specific error code and examine live data to pinpoint the issue within the fuel system.

4. What are some possible repair tips for fixing the Long Term Fuel Trim Error System Rich?

- Repair tips may include replacing the oxygen sensor, cleaning or replacing fuel injectors, repairing any vacuum leaks, checking the mass airflow sensor, and ensuring proper fuel pressure.

5. Can driving with the OBDII code P1123 Hyundai cause further damage to my vehicle?

- Continuing to drive with this code may lead to decreased fuel efficiency, potential damage to the catalytic converter, and further engine performance issues if left unresolved.

6. How urgent is it to address the OBDII code P1123 Hyundai?

- While the vehicle may still be operable with this code present, it is advisable to address the issue promptly to prevent any long-term damage and to ensure optimal engine performance.

7. Is it possible to reset the OBDII code P1123 Hyundai without fixing the underlying issue?

- Resetting the code without addressing the underlying problem will only temporarily clear the error code, as it is likely to reappear once the issue persists.

8. Can a DIY enthusiast fix the OBDII code P1123 Hyundai, or is professional help recommended?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to address this code themselves. However, seeking professional help is recommended for accurate diagnosis and proper repair.

9. How much does it typically cost to repair the OBDII code P1123 Hyundai at a mechanic or dealership?

- The cost of repairing this code can vary depending on the specific issue, parts needed, and labor rates, but it may range from a few hundred to over a thousand dollars at a mechanic or dealership.

10. Are there any preventative maintenance tips to avoid triggering the OBDII code P1123 Hyundai in the future?

- Regular maintenance, such as timely replacement of oxygen sensors, fuel system inspections, and keeping up with recommended service intervals, can help prevent issues that may trigger this code.