Audi P1138: Long Term Fuel Trim Add. Fuel, Bank 2 System Too Lean
Is your scanner showing Audi P1138?
No worries. We'll show you what it means and how to deal with it.
Audi P1138: Long Term Fuel Trim Add. Fuel, Bank 2 System Too Lean
OVERVIEWWhat Does The Audi P1138 Code Mean?
Condition for setting the DTC: Engine started, battery voltage must be at least 11.5v, all electrical components must be off, the ground between the engine and the chassis must be well connected, the exhaust system must be properly sealed between the catalytic converter and the cylinder.
What Are The Potential Causes Of The Audi P1138 Code?
Below are some potential causes of this DTC:
- Air intake system leaking, vacuum hoses leaking or damaged
- Air leaks located after the MAF sensor mounting location
- EGR valve sticking, EGR diagramleaking, or gasket leaking
- EVAP vapor recovery system has failed
- Excessive fuel pressure
Recommended Parts
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
>>> Audi Exhaust Gas Recirculation (EGR) Valve
>>> FEL-PRO MS 96780 Intake Manifold Gasket Set
>>> Autobahn88 Silicone Vacuum Hose Dress Up DIY Kit
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
Reference Sources
- Audi of Ameria, 2013, Technical Service Bulletin.
- Audi of Ameria, 2015, Technical Service Bulletin.
- Audi of Ameria, 2020, Technical Service Bulletin.
- Audi of Ameria, 2020, Technical Service Bulletin.
- Omnitek Engineering Corp., 2020, Diagnostic Trouble Code (DTC) Guide for Omnitek ECM 64A/66A/88A, page 132.
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