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Code 1264 o2 heater relay circuit. Changed o2 no change

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    Code 1264 o2 heater relay circuit. Changed o2 no change

    it’s a 525i m50 motor in 1988 e30
    This wasn’t a problem to I had a no start issue from accidentally cuttings. Wire. After installing a engine wire harness cover
    has a misfire rn coming from 1 or more cylinders
    something electrical related
    coils
    dme or wires
    or plugs I will figure it out
    what grounds are tied to ego heater
    never had this issue before trying to get cel off
    I HAVE A CEL CODE 1264
    I bWENT AHEAD AND REPLACED THE O2 sensor
    still no change THE CODE READS OUT TO BE EGO HEATER CIRCUIT IM THINKING I
    has anyone had this code with a 24v swap car ??
    1264 ego heater
    o2 sensor heater relay.
    anynadvice where I should start with the multimeter ? Where to check for power first ? Or where I should start searching for a short
    Also using a non oem o2.
    also I swapped out dme’s when diagnosing the a start issue in the past. Soo I’m not sure which one I originally used and if that could be the cause. Going to start tracing all wires back and lebelung them to rule out cut wire or short
    I had a no start issue form accidentally cutting a wire that went to ignition switch.
    It’s possible there’s another cut wire I missed.
    where is this relay related to this
    Any direction on where to start would be helpful
    willing to pay for good advice
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