I have a question, if i have many codes from my ELM 327 OBDII, Mass sensor, Km traveled, Lambda, Temp, fuel pressure, gallons x time, engine load.... hao i can calculated these emissions?


No, it is not possible to get true values from OBD-II ELM327.

You have to have a dedicated exhaust gas analyzer to figure that out, like this one:

Gas analyzer

But you can estimate it using a lambda sensor

Although I fear that the theoretical graph is not going to be very useful in the real world:

AFR Chart

  • Thanks! I´ll try with these information, i know is not easy but maybe this formula exist, Sep 28 '16 at 14:50
  • If I'm interpreting that chart correctly, looks like you'll especially have issues calculating backwards for richer mixtures, where the O2 curve flattens out.
    – Jason C
    Sep 28 '16 at 14:56
  • Hey! For diessel motor? Do you have it? Sep 28 '16 at 14:56

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