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Thread: Odometer and fuel level with OBD

  1. #1
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    Join Date
    Sep 2007
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    Odometer and fuel level with OBD

    Hi,

    I am looking for a device which can query a car's system and get the odometer and fuel level values.

    Do OBD devices offer this facility ?
    If not OBD, do I have any other options ?

    PS: I want a device with RS232 serial interface.

    Thanks!

  2. #2
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    Join Date
    Aug 2007
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    Detroit, MI
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    Yes, most devices that are used to get OBD data can also get non-OBD data (e.g. odometer). Fuel level is a legislated OBD parameter, but many vehicles do not provide the value (typically, the older the vehicle, the less likely it is to provide fuel level). Although odometer is not a legislated OBD parameter (as far as I know), it is available on many vehicles, though usually only by request (i.e. it's not broadcast). It must be requested of a module such as the instrument cluster, and this request can be made (and response received) through many OBD devices. A low-cost device that would suffice is the ELM327 (available on mp3car.com, and elsewhere such as www.scantool.com). How to get odometer from your vehicle (and whether it even provides it) depends on the vehicle model and model year.

  3. #3
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    Join Date
    Jun 2008
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    6
    Quote Originally Posted by Carlocutor View Post
    It must be requested of a module such as the instrument cluster, and this request can be made (and response received) through many OBD devices. A low-cost device that would suffice is the ELM327 (available on mp3car.com, and elsewhere such as www.scantool.com). How to get odometer from your vehicle (and whether it even provides it) depends on the vehicle model and model year.
    Can we find more information on how to search and access and query these vehicle modules? I have a Citroen C4 2007 and it does not provide the fuel level through the normal OBD protocol . I'm using a bluetooth based ELM327...

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