ACDelco PT818 (superseded by PT2054, GM P/N 88988598)
Compatible GM part numbers: 25723345, 25748239, 25750594, 15751934, 25748236, 25750591, 12167154 (all replaced by 88988598).
Description: Multi-purpose pigtail connector. Commonly used as an oxygen sensor connector for a wide range of Chevrolet models from 1996–2017.
?? For full application details, please refer to acdelco.com.