Thread: P0172 = MIXTURE ADAPTION FACTOR FRA

I think that is related to an after market rear bar. Best take it off and give to me so I can diagnose if it effects my car as well..


Just kidding. I'll leave this thread for sensible replies

Hi

This error only seems to occur on LPG, perhaps I need another LPG tuneup to make sure it is adjusted for the new MAF and O2 sensors?

I am also going to double check for vacuum leaks

Steve

I would get a tune up done on the LPG system. Although I am not familiar with that exact fault, obdii systems are supposed to monitor the O2 sensors to validate changes they make to fuel trim. If the LPG is running rich for example, the Ecu will read the O2 sensors and try to compensate by changing injector pulse. If the LPG system is not controlled via the Ecu inj pulse, the change will not have any effect on he actual fuel mix and the Ecu wont see a corresponding change from the O2 and may. flag a fault.

Hth

What are the LTFT saying for both banks?

I have this fault as well. I am starting to think that the LPG system which is soldered into the Engine ECU loom to grab O2 sensor feeds is affecting the voltage/resistance of that signal line and confusing the closed loop feedback system. I only say this, because I like you, have replaced all the offeding sensors to no avail. My problem is both banks, so it could also be inlet manifold, but no leaks have been detected there...