NTK EF0123 Engine Coolant Temperature Sensor - Front

Overview

NTK EF0123 is an engine coolant temperature sensor built for import and domestic applications that require accurate coolant temperature input for engine management. It features a 2-terminal pin design with an oblong female connector, and it is listed for Mercedes-Benz and Jeep applications across multiple model years.

As part of the NTK Engine Coolant Temperature Sensor line, this sensor reflects NTK’s OE-focused approach to technical sensors and broad aftermarket coverage. The EF0123 part number is also referenced for several Mercedes-Benz AMG and non-AMG applications, including Mercedes-Benz C63 AMG, E63 AMG, and SLK230 fitments.

Key Features

• Engine coolant temperature sensor for temperature signal input to the engine control system
• 2-terminal pin configuration with an oblong female connector
• NTK technical sensor line backed by OE-oriented engineering and testing
• Listed for multiple Mercedes-Benz and Jeep applications
• Cross-references Monroe Shocks & Struts 172286 and 182286 for the same application

Detailed Description

NTK EF0123 is engineered as a direct replacement-style coolant temperature sensor for a wide range of Mercedes-Benz and Jeep vehicles. Fitment includes 1994-2017 Mercedes-Benz applications such as C63 AMG, E63 AMG, SL63 AMG, SLK230, C280, and S320, plus 2007-2009 Jeep Grand Cherokee coverage. The sensor uses a female oblong connector and 2-pin terminal layout, which is important when matching the electrical connection during replacement.

NTK positions this sensor line around OE application technology and extensive validation. The brand states that its technical sensors are tested under thermal shock, vibration, and OBD verification conditions, and that the finished parts are built to meet or exceed OE specifications. For buyers searching for a Mercedes-Benz coolant temperature sensor or a Jeep Grand Cherokee engine coolant temperature sensor, EF0123 provides a fitment-specific replacement option.

What It Helps Fix

• Incorrect coolant temperature readings sent to the engine control system
• Hard starting or rough running related to faulty temperature input
• Cooling fan operation issues caused by a failing sensor signal
• Check engine light conditions tied to coolant temperature sensor faults
• Replacement needs for damaged connector or worn sensor terminals

Installation Notes

Verify connector shape, terminal count, and mounting location before installation. Fitment notes show some applications located in the block, on the thermostat housing, or near the fuel pump, so confirm the original sensor position on the vehicle before ordering. This part uses a female connector with 2 terminals and does not include a wiring harness.

Quality Assurance

NTK states that its technical sensors are manufactured to meet or exceed OE specifications and are validated through thermal shock, vibration, and OBD testing. The brand also notes its OE supplier background and long-standing automotive experience in sensor technology.