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Disable OBD codes

  • 25-09-2024 7:57pm
    #1
    Discodog
    Registered Users, Registered Users 2 Posts: 15,922 ✭✭✭✭


    Could an unscrupulous mechanic stop fault codes from showing? I had a major repair done. Now the car won't start but no fault codes are showing.



Comments

  • #2
    Whocare
    Registered Users, Registered Users 2 Posts: 1,176 ✭✭✭Whocare


    https://www.boards.ie/discussion/2058370485/disable-obd-codes

    Maybe you're using cheap obd reader



  • #3
    Discodog
    Registered Users, Registered Users 2 Posts: 15,922 ✭✭✭✭Discodog


    It's read codes on the same car before



  • #4
    greasepalm
    Registered Users, Registered Users 2 Posts: 5,483 ✭✭✭greasepalm


    What type of car and the issues that came up before. We had 3 scanners in the garage and one picked up more fault codes. Try the second key yet ?



  • #5
    User1998
    Registered Users, Registered Users 2 Posts: 7,025 ✭✭✭User1998


    Nha don’t think you can do that. Can clear them but they come back eventually



  • #6
    greasepalm
    Registered Users, Registered Users 2 Posts: 5,483 ✭✭✭greasepalm


    Faults come back because car has an issue and needs to be repaired , hence why you need to know where to look and for what.



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  • #7
    extra-ordinary_
    Registered Users, Registered Users 2 Posts: 1,791 ✭✭✭extra-ordinary_


    in what way does the car not start?



  • #8
    Discodog
    Registered Users, Registered Users 2 Posts: 15,922 ✭✭✭✭Discodog


    It's a diesel xtrail. Became reluctant to start & now refuses to. Thought it was the glow plugs but they test ok.



  • #9
    greasepalm
    Registered Users, Registered Users 2 Posts: 5,483 ✭✭✭greasepalm


    Google issues for your model as might come up with a common issue.

    So the glow pugs are getting a feed and you checked it to see if the correct voltage is there?

    Do you know remember what the fault codes were?



  • #10
    Dirty Nails
    Registered Users, Registered Users 2 Posts: 483 ✭✭Dirty Nails


    https://www.boards.ie/discussion/2058370485/disable-obd-codes

    Ignore the lack of codes,not everything will show one. Look at live data when cranking, rpm signal & rail pressure especially.Maybe air flow as well. See if the EGR pipe gets warm after cranking,it may be stuck open. Prime the plastic bulb near the fuel filter,prone to crack & draw air.



  • #11
    mk7r
    Registered Users, Registered Users 2 Posts: 791 ✭✭✭mk7r


    Its possible with a remap to remove codes from showing, very common in the cheap dpf removal world for the remap to just disable all the fault codes instead of just the dpf.

    Also there are obd fault codes which a cheap reader can read and manufacturer specific faults codes which cheap readers won't be able to see.



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