P0172 JEEP – Fuel System 1/1 Lean Fuel System Rich

 

P0172: DIY Repairing Video Tutorial

https://youtu.be/PpFuGHxnD0g

Check out nonda Auto DIY Center for more engine error code repairing videos.
https://www.youtube.com/playlist?list=PL-Lyko0O0oxHe1AGvzwAz-wokJPXAtW97

 

P0172 JEEP Possible Symptoms

  Engine Light ON (or Service Engine Soon Warning Light),Excessive Fuel Consumption  

P0172 JEEP Possible Causes

  Faulty front heated oxygen sensor,Ignition misfiring,Faulty fuel injectors,Exhaust gas leaks,Incorrect fuel pressure,Faulty Mass Air Flow (MAF) sensor  

P0172 JEEP Description

  With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).