Hi !

I have a problem with my LS460 AWD.

"Check engine" light is on, OBD II scanner shows p0175,p0172,p1170 codes.

P0172 - System Too Rich Bank 1
P0175 - System Too Rich Bank 2
P1170 - Port Injector Fuel Performance

Engine works as usual very well, I don't feel any changes

In case of erasing codes, they appear again after several tens of miles.

Does anyone know how to solve it ?

Thank you !

 

Likely fuel pressure too high in the port injection circuit. The regulator may be sticking. Had this exact issue on a 2007 Yukon.

 

Thank you for your answer !

I'd like to precise - did you have all 3 fault codes (p0175,p0172,p1170 codes) on your Yukon ?