ACDelco 55488558 Heated Oxygen Sensor

The ACDelco 55488558 is a GM Genuine Parts heated oxygen sensor designed as a direct replacement for late-model GM vehicles. This sensor detects oxygen content in the exhaust gases to help optimize emissions and ensure proper engine performance.

Key Features:

• GM Genuine Parts original equipment quality
• Heated sensor design for faster response time and accurate readings
• Monitors exhaust oxygen levels to optimize air/fuel ratio
• Helps maintain optimal engine performance, fuel economy, and emissions control
• Features permanently attached pigtail and electrical connector
• Typically used as a downstream/lower oxygen sensor (Bank 1 Sensor 2 position)

Important Installation Note:

This part requires programming and/or special setup procedures after installation. Professional installation with access to GM Service Information and proper diagnostic tools is recommended to ensure correct operation.

This oxygen sensor works by measuring the proportion of unburned oxygen in exhaust gases and sending feedback to the engine control module (ECM), allowing it to adjust the air/fuel mixture to the optimal ratio of 14.7:1 for maximum efficiency, performance, and emission control. Backed by GM's factory warranty, this genuine part is engineered and tested to rigorous standards set by General Motors.