Chevrolet Downstream Rear Oxygen Sensor 55572216 Replaces 213-4698/55574136

When your Chevrolet has rough idle, obvious fuel consumption increase, check engine light on, or emissions exceed standards, downstream rear oxygen sensor is aging or failing and cannot accurately monitor oxygen after the catalyst. This sensor correctly monitors oxygen level in exhaust and feeds back to ECU to adjust air-fuel ratio; this product is OEM replacement 55572216, compatible with 213-4698, 55574136 and 234-4528 models for many Chevrolet models. Installation notes: sensor harness length about 30 cm; ensure connectors are firmly seated; avoid wrapping cables around exhaust or underbody components; after installation, use a diagnostic tool to clear fault codes and reset learned adaptations.