2006 Honda Civic Hybrid P0401 Code: OBD2 EGR Test ID $D2 Below Minimum Specification

Model: 2006 Honda Civic Fault Code: P0400 Posted: 2019-02-18 15:37

I own a 2006 Honda Civic Hybrid and am investigating a persistent P0401 diagnostic trouble code. During my OBD2 diagnostics, I discovered that the Onboard EGR test in Mode $06, specifically Test ID $31, is showing TID $D2 values below the manufacturer-specified minimum threshold. My OBD2 reader only displays 'Manufacturer Specified' for this test, offering no detailed explanation. Can anyone clarify what Test ID $D2 represents and whether it's a known parameter related to EGR system performance or exhaust flow? Any technical insight into how TID $D2 affects P0401 detection would be greatly appreciated.