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dtc code help

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
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dtc code help

Post by HumbleT6Noob » Mon Aug 05, 2019 7:22 am

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

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Re: dtc code help

Post by SuperHerman » Tue Aug 06, 2019 4:06 pm

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.

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Re: dtc code help

Post by RickHaleParker » Tue Aug 06, 2019 7:01 pm

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.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, B8444S TF80 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger. V8 conversion in progress.

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