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Passat 1.4 TSI 122 BHP

  • 15-10-2019 6:43pm
    #1
    John.G
    Registered Users, Registered Users 2 Posts: 3,623 ✭✭✭


    Above car has 260K kms up and is, per owner, running very well but once in the past year the emissions warning light came up which was obd fault code P0299 (turbo boost pressure low) which he reset and hasn't appeared since.

    Someone who is familiar with looking at these trends might take a look at the attachment and comment. Just a few of my own observations, at idling speed and with engine stopped the specified boost pressure was 330MB and the actual boost pressure was 990 MB so obviously no boost required, also atmospheric pressure today here was 990mb, it seems a bit strange that the specified boost pressure is so low (assuming absolute) since the minimum boost pressure is atmospheric. Also the highest recorded specified boost was 1640MB with an actual of 1320MB, a difference of 320MB, one would think that these differences would flag a fault code, AFAIK the 122 BKP max boost pressure is 0.8bar or 1800 MB absolute.


Comments

  • #2
    John.G
    Registered Users, Registered Users 2 Posts: 3,623 ✭✭✭John.G


    Found another bit of data in that spreadsheet and it shows that the controller N75 was only asked for 100% duty over a few short periods, I havn't seen the car but will try and down load a bit more data, I,m assuming that N75 controls the waste gate but that there is a variable vane turbo fitted? to it so should be able to get VCDS to add some info from its actuator.


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