C5 P0170 code
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Thread: C5 P0170 code

  1. #1
    Fellow Frogger! BallinaOB's Avatar
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    Default C5 P0170 code

    Hi,
    My C5 (2003) 2.0 petrol auto has just started to experience intermittent power loss which occur normally when accelerating up an incline. My code scanner some times displays a P0170 code, sometimes no code is displayed just the anti pollution light on the dash display. We had some air conditioning work done on the car in Brisbane about 2 months ago and the problem only started a day or two after this on our way back to Bathurst. Had filled up with BP 98, as per usual, at a service station I have never been to before and the pumps did look a little dirty. Have had at least 3 full tanks worth of petrol through the car since.

    Have done some trips without an issue, while on other trips we will have 4 or 5 power issues. Most notably after driving around in stop start city traffic for awhile.

    Has any one on the list had a P0170 code before which they have fixed?

    Have done a fair bit of Internet research which throws up a few suggestions, just want to get a little more knowledge before we can get the car down to Sydney for a Comprehensive scan on a dealer's equipment.
    Thanks,

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    Anthony O'Brien
    2008 C5
    2007 C4
    2004 C5 Estate

    Previous
    2003 C5
    2004 C2 (now with youngest son)
    2006 C2 (now with eldest son)

  2. #2
    Contented Peugeot Driver addo's Avatar
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    Why not buy a Lexia or Diagbox clone, a used laptop with Windows XP Pro and see the live parameters?

    A generic scan tool can offer anything from red herring, through half-baked facts, to the whole truth. You just can't rely on it. The gear above, will cost similar to the fuel for one return trip to Sydney.

    You know, my 2.0 petrol auto Xantia has been suffering antipollution faults and a loss of power - especially when driving up inclines with a modest load in tow. In my case, it's a paralytic converter issue.

  3. #3
    Fellow Frogger
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    It seems to be a 'richness regulation' fault. Maybe, the oxygen sensor? That could result in a substantial loss of power, so you might check it's connector is OK to begin with. You can check the heater circuit of the sensor, but it's possible there could be bad connections or other problems to look at first. The MAP sensor might also be worth considering and it's cheaper than an oxygen sensor. The breather pipes are prone to cracking and there is a purge valve on the manifold that can also fail. You might want to clean out the throttle body and sometimes the inlet tracts coke up, which a fuel additive might help with. Catalysts can simply become blocked with age, so a local muffler place could presumably check this for you without a dealer visit.

  4. #4
    Fellow Frogger! BallinaOB's Avatar
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    Thanks for the replies, both on the forum and direct to my email (some very useful information there).

    I have given the C5 a good wash, vacuum and interior detail. Tucked her up safely in the garage awaiting her trip to Sydney to visit Lexia for an extended session swapping personal information and surgical stories.
    David she has been high on fuel additives for awhile now but we have not seen any improvement in her behaviour and before we get to Sydney she is booked in to have her catalysts checked with a local exhaust specialist.

    I will keep the forum informed of any change in her on road manners.

    Have a good day.
    Anthony O'Brien
    2008 C5
    2007 C4
    2004 C5 Estate

    Previous
    2003 C5
    2004 C2 (now with youngest son)
    2006 C2 (now with eldest son)

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