A carbon balance error verification compares independent assessments of the flow of carbon through the system (engine plus aftertreatment). We will, and you may optionally, verify carbon balance error according to 40 CFR 1065.543. This section applies to all test intervals in §§ 1036.535(b), (c), and (d) and 1036.540 and 40 CFR 1037.550.
[86 FR 34402, June 29, 2021]