P1128 – Hyundai DTC

Hyundai DTC P1128 – Long term fuel trim – system too lean

DTC P1128 meaning on Hyundai

The DTC P1128 on a Hyundai indicates that the long term fuel trim system is too lean. This means that the engine is receiving more air than fuel, resulting in a lean air-fuel mixture.

Hyundai DTC P1128 symptoms

Common symptoms of DTC P1128 on a Hyundai may include:

• Check Engine Light illuminated
• Poor engine performance
• Reduced fuel efficiency
• Rough idling or stalling

Hyundai DTC P1128 causes

The potential causes of DTC P1128 on a Hyundai include:

• Vacuum leaks
• Faulty oxygen sensor
• Clogged fuel injectors
• Fuel pump issues
• Intake air leaks

Hyundai DTC P1128 seriousness

While DTC P1128 may not cause immediate harm to the engine, it can lead to poor performance and reduced fuel efficiency. Ignoring this issue can potentially cause damage to other engine components over time.

How to diagnose DTC P1128 on Hyundai

To diagnose DTC P1128 on a Hyundai, a mechanic may perform the following steps:

1. Use a scan tool to retrieve the trouble code
2. Inspect for vacuum leaks
3. Check the oxygen sensor functionality
4. Clean or replace clogged fuel injectors
5. Test the fuel pump pressure

How to fix DTC P1128 on Hyundai

To fix DTC P1128 on a Hyundai, the following steps may be taken:

1. Repair any vacuum leaks
2. Replace a faulty oxygen sensor
3. Clean or replace clogged fuel injectors
4. Address any fuel pump issues
5. Fix any intake air leaks

How to erase DTC P1128 on Hyundai

To erase DTC P1128 on a Hyundai, the code can be cleared using a scan tool. Once the underlying issue has been addressed and fixed, the code can be cleared to reset the Check Engine Light.