XL3Z6G004AA Replacement Engine Coolant Cylinder Head Temperature Sensor is a directfit replacement sensor designed to restore accurate temperature monitoring for engines that use the XL3Z6G004AA part number. It measures cylinder head/coolant temperature and sends that information to the engine control system, helping maintain correct engine operation and cooling system performance. Key benefits Restores accurate temperature readings so the engine control unit (ECU) can manage cooling fans, ignition timing, and fuel trim correctly. Helps resolve symptoms of a failed sensor such as overheating warnings, erratic temperature gauge behavior, poor fuel economy, hard starting, or an illuminated diagnostic trouble code. Directfit replacement for XL3Z6G004AA to simplify installation and reduce downtime. What this sensor does Monitors cylinder head or engine coolant temperature and relays a voltage or resistance signal to vehicle electronics. Enables the vehicle's cooling system and engine management to respond to temperature changes quickly and reliably. Supports stable idle, emissions control, and fuel efficiency by providing accurate temperature data. Key attributes Part number: XL3Z6G004AA — exact replacement for applications requiring this sensor. Functionality: Cylinder head / coolant temperature sensing for engine control and cooling system activation. Fitment: Directfit replacement for vehicles that use the XL3Z6G004AA sensor; designed to match the original connector and mounting location. Construction: Built for the thermal and fluid environment of the engine's cooling passages; corrosion and vibrationresistant design to withstand normal service conditions. Performance: Fast, accurate temperature response to support reliable engine management and cooling control. Use cases and applications a failed temperature sensor after receiving a temperaturerelated trouble code or when the temperature gauge behaves erratically. Install during head gasket, cylinder head, or cooling system repairs to ensure the vehicle's temperature sensing is fresh and reliable. Preventative maintenance for older vehicles to reduce the risk of unexpected cooling system issues and to maintain correct engine performance and emissions. Installation notes Designed as a plugandplay replacement for the XL3Z6G004AA sensor; connector and thread/mounting form are intended to match the original sensor. Basic hand tools are usually sufficient for removal and installation. If a diagnostic trouble code is present or engine control adaptations are required, scan tool clearing or further diagnostics may be recommended. What to expect after installation More consistent temperature readings, improved cooling fan control, and more stable engine operation. Reduction or elimination of temperaturerelated warning lights or fault codes when the original sensor was malfunctioning. This product is provided as a replacement for the XL3Z6G004AA engine coolant cylinder head temperature sensor. Verify that your vehicle requires part number XL3Z6G004AA before to ensure proper fit and function.