O2 Oxygen Sensor Extension Wire Harness; Upstream (16-19 Silverado 3500 HD)Find parts that fit my vehicle

Engine Performance Optimizer. The O2 Oxygen Sensor Extension Wire Harness (Upstream) fits Chevrolet Silverado 3500 models. This extension allows the upstream oxygen sensor to be relocated farther along the exhaust system—commonly required when installing aftermarket headers or custom exhaust components. It maintains proper air‑fuel ratio sensing by preserving full plug‑and‑play compatibility and preventing wiring strain.

Construction and Appearance. Constructed from high‑quality, heat‑resistant wiring with durable OEM‑style dark grey connectors molded to factory specifications. The harness is fully plug‑and‑play; the connector features keyed housing to ensure correct orientation and connector compatibility.

Installation. Installation is straightforward and requires no cutting or splicing—simply plug the extension inline with the factory upstream O2 sensor wiring. Drilling is not required; the process is typically completed in under 30 minutes.

Warranty. There is a limited 30-day warranty included when you purchase this product.

Application. This O2 Oxygen Sensor Extension Wire Harness (Upstream) fits 2019 Chevrolet Silverado 3500 models.

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