1635400717 Front ABS Wheel Speed Sensor for Mercedes-Benz M-Class W163 ML320 ML430 ML500 1998-2003

Mercedes-Benz W163 M-Class Front Sensor — First Generation ML: The W163 was Mercedes-Benz first SUV, built in Tuscaloosa, Alabama from 1998-2003 (facelift MY2002-2005). The 1635400717 front sensor services the pre-facelift W163 models — ML320 (M112 V6 3.2L), ML430 (M113 V8 4.3L), and ML500 (M113 V8 5.0L). The W163 uses Bosch ABS 5.3 / ESP 5.7 systems that demand significantly different signal characteristics than GM 4WAL or Kelsey-Hayes systems.

Bosch ABS 5.3 Compatible — High-Resolution Signal Required: The W163 Bosch ABS 5.3 module uses a 48-tooth tone ring at each wheel, producing 48 pulses per wheel revolution — significantly higher resolution than typical North American systems. The Hall-effect IC must produce clean, square-wave output at all 48 transitions per revolution, from near-zero parking speeds through Autobahn velocity. Any missing or distorted pulse triggers a wheel speed sensor plausibility DTC and disables ESP.

Critical for the W163 Early ESP System: The W163 was one of the first SUVs equipped with Electronic Stability Program (ESP) as standard equipment, and the system relies on front wheel speed data for both understeer and oversteer detection. A failing front sensor not only disables ABS but also extinguishes ESP functionality — a serious safety concern on a tall, short-wheelbase SUV that Mercedes engineered ESP specifically to stabilize.

Built for the W163 Body-on-Frame Abuse: Unlike the unibody ML that followed (W164), the W163 uses body-on-frame construction with a ladder frame that transmits significantly more vibration to the suspension components. ZENTRAQKMS uses a vibration-isolated sensor body with internal elastomer damping that prevents high-frequency chassis vibration from causing fretting corrosion at the gold-plated Bosch-spec connector terminals.

Direct Plug-and-Play with Bosch 2-Pin Compact Connector: The W163 uses Bosch compact 2-pin sensor connector — often called the Bosch Junior Timer connector. Every 1635400717 sensor has a connector molded to the exact Bosch specification with gold-plated terminals and a silicone perimeter seal. No adapter harnesses, no terminal crimping — unplug the old sensor, plug in the new one, and the ABS/ESP light extinguishes after a short test drive.

Product Overview

Key Features

Technical Excellence

Durability Engineering

Perfect Fitment

Installation Confidence

Why Choose ZENTRAQKMS

ZENTRAQKMS is committed to delivering automotive sensors that meet or exceed OEM specifications. Every ABS wheel speed sensor is manufactured in ISO/TS 16949 certified facilities using premium-grade components — including samarium-cobalt magnets for thermal stability, Hall-effect ICs from Infineon and Bosch-licensed suppliers, and silicone-jacketed harnesses for extreme-temperature durability. Each sensor undergoes 100% end-of-line testing on dynamic encoder wheel rigs before packaging.