Diagnostic Trouble Codes/ Error Code- VW/Audi/Skoda
13 Feb,2023
P0171: System too lean (bank 1)
"P0171: System too lean (bank 1)" is a diagnostic trouble code (DTC) that is commonly found in Audi and other vehicles. The code indicates that the engine management system has detected an excessively lean air/fuel mixture in bank 1 of the engine.
An air/fuel mixture that is too lean means that there is not enough fuel in the mixture compared to air, which can cause a variety of problems. Some of the common causes of this code include:
- A vacuum leak in the intake system
- A clogged or dirty air filter
- A failing mass air flow (MAF) sensor
- A malfunctioning fuel injector
- A leaking fuel pressure regulator
It is important to diagnose and repair the cause of the P0171 code to ensure the proper operation of the engine and prevent further damage. A proper diagnosis should be performed by a qualified mechanic or dealership service center.