dtc code help

[HumbleT6Noob]

02 s80 t6 Pulling p0175,p0172,p0496 any help would be greatly appreciated.

[SuperHerman]

How many miles and what has been the general service history on the car? What if any work have you done to it recently? How often has it happened or on one day did they all appear?

You need to look at all your plastic and rubber hoses. Make sure you have no air leaks.

First code could be dirty fuel injectors. Try a can of cleaner in the gas. Second code is O2 sensor related, go through hoses first and if you can check fuel trims that would help focus on air leaks.

Final code is your evap system. Start with hoses and then check your purge valve. Shouldn't hurt to try and clean it with some brake cleaner/MAF cleaner - success this route not optimal, but worth a shot.

[RickHaleParker]

P0172 ECM-261A Long-term fuel trim Lower limit
P0175 ECM-271A Long-term fuel trim, bank 2 Lower limit
P0496 ECM-431D Leak diagnostic unit. Signal too high

P0172 ECM-261 and P0175 ECM-271A Possible source
Lower limit:

• intake air leakage
  high fuel pressure
  leaking injectors
  defective mass air flow (MAF) sensor
  contaminated engine oil
  oil level too high
  defective heated oxygen sensor (HO2S)

P0496 ECM-431D
Possible source
Signal too high:

• Contact resistance in the terminals
  Blocked filter in the leak diagnostic unit
  Blocked hose between the filter and the leak diagnostic unit
  Defective leak diagnostic unit.