Can anybody re-create an OBD2 system for a Nissan RB26DETT engine?

The discussion centers on the challenge of creating or retrofitting an OBD2 system for the Nissan RB26DETT engine, specifically for R34 Skyline models (1999-2001) that were never originally equipped with OBD2, to comply with California emissions regulations. Standard off-the-shelf OBD2 readers, typically based on the ELM327 chip, decode OBD2 data streams but cannot be used since the vehicle lacks an OBD2 system. Designing an OBD2 reader from scratch requires understanding the CAN bus protocol and access to a CAN bus data analyzer to interpret raw data. However, the main obstacle is the absence of an OBD2-capable ECU in these vehicles. The consensus suggests that the practical approach is to retrofit or replace the existing ECU with one that supports OBD2 encoding, as building a complete OBD2 system from the ground up is a complex and substantial engineering project.
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