Mazda 5 RF7J engine HELP

I have a Mazda 5 furano cr19 diesel, I am at a loss after tearing the car down to find the upstream 02 sensor that has thrown a code but no luck, I have come to the conclusion that it’s not got one in the upstream because the temperature and pressure sensors in the DPF.

I need help with diagnosing what it could be instead, in case it’s throwing a generic code for something else in the car, it also comes with ABS module code and DPF light at the same exact time.

Diagnostics on the DPF computer show no issues but that could be BS as well.

Note, I have thought could the purge valve be the culprit causing a vacuum leak.
 

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