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Autopapyrus · MAN TGS (1st generation)
https://autopapyrus.com/guides/man/tgs/front-left-abs-wheel-speed-sensor-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

MAN TGS (1st generation): Front Left ABS Wheel Speed Sensor Replacement

The ABS sensor is installed in the front axle hub and reads the signal from the tone ring (exciter). Typical signs of failure: the ABS warning light is on and the control unit has a wheel sensor fault stored in memory. The cause can be dirt, an excessive air gap, a damaged cable or a corroded connector. The exact procedure for your specific configuration is not documented in public sources, so the general principle for trucks with a sensor in a sleeve is given below.

Difficulty: Medium Time: 1-1.5 hours Steps: 13 Tools: Jack or lift and safety stands, lug wrench, torque wrench, hex keys and sockets (size depends on the sensor mounting), grease for the sensor sleeve, contact cleaner, multimeter, plastic zip ties, shop rags

Part

  • 🔩 ABS wheel speed sensor, front (left) for MAN TGS, and the sensor sleeve (bushing) if needed. Aftermarket equivalents are available for the TGS front axle (for example, Febi) that fit both the left and right side. The exact OE number depends on the axle type and brake system, so compare the new sensor with the old one by connector shape, cable length and mounting type

Step by step

13 steps
  1. Park the vehicle on a level surface, apply the parking brake and place wheel chocks behind the rear wheels. Turn off the ignition and, if necessary, disconnect the battery negative terminal.
  2. Loosen the front left wheel nuts, raise the front axle and set safety stands in place. Remove the wheel.
  3. Before replacing, check the old sensor and wiring. Measure the coil resistance with a multimeter (the value depends on the sensor type, so compare it with the new one). Inspect the cable for chafing and the connector for corrosion, since the problem may be right there.
  4. Trace the sensor cable from the hub to the connector. Release the clips and zip ties on the brake hose and axle components, and note the routing.
  5. Disconnect the sensor connector. Do not pull on the wire; press the locking tab instead.
  6. Clean the area around the sensor of dirt and brake dust so it does not fall into the bore.
  7. Remove the sensor from the sleeve. If it is stuck, rock and twist it without hard blows or pliers on the body. You can warm the sleeve slightly and apply penetrating oil. If there is a retaining bolt, remove it first.
  8. Inspect the sleeve for wear and deformation, and the tone ring for damaged teeth and dirt. With a damaged ring or a worn sleeve, the sensor will keep giving a fault even after replacement.
  9. Apply a thin layer of special grease to the body of the new sensor and to the sleeve. This protects against seizing.
  10. Insert the sensor into the sleeve all the way so that it lightly touches the tone ring. The correct air gap is set automatically as the wheel turns; push the sensor by hand until it contacts the ring. Secure it with the bolt (tightening torque per the manufacturer's specification, approximately low, 8-10 N·m (6-7 lb-ft)).
  11. Route the cable along the original path and secure it with zip ties without tension or sharp bends, away from moving parts and hot components. Connect the connector until it clicks.
  12. Install the wheel and tighten the nuts in a crisscross pattern. Lower the vehicle and tighten the wheel nuts to final torque with a torque wrench per specification.
  13. Turn on the ignition. The ABS light should go out once the vehicle starts moving (usually at a speed of about 7-10 km/h). Take a test drive. If the fault persists, read and clear the memory with a diagnostic scan tool.

Common mistakes and warnings

  • ABS is a safety system. If you have no experience working on truck brake systems, leave the job to a repair shop. Never work under a vehicle supported only by a jack. Before driving, make sure the ABS light has gone out and the brakes work normally.
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