What is the reason why the ABS sensor of Sagitar always breaks down?

[MarianaRose]

ABS sensor damage is related to driving, and it may also be caused by poor quality of accessories. The relevant introduction of ABS sensor is as follows: Introduction 1: The ABS sensor is used in the ABS (Anti-lock Braking System) of motor vehicles. Most ABS systems use inductive sensors to monitor the vehicle speed. The ABS sensor works with the gear ring that rotates synchronously with the wheels. Introduction 2: It outputs a set of quasi-sinusoidal alternating current signals, whose frequency and amplitude are related to the wheel speed. This output signal is transmitted to the ABS electronic control unit (ECU) to achieve real-time monitoring of the wheel speed.

[LaJasmine]

My Sagitar has been running for six years, and all four ABS sensors have been replaced at least once. The most frequent issue was them failing every six months. The mechanic at the repair shop suggested the problem might lie in the chassis design—the sensors are installed too close to the tires, making them prone to getting clogged with mud and debris kicked up by the wheels. Additionally, the iron dust from worn brake pads mixes with water to form a muddy paste that sticks to the sensors, interfering with the signal. I later noticed that whenever I drove through waterlogged roads on rainy days, the sensors would inevitably throw an error within a few days. Now, every time I wash the car, I ask the mechanic to use an air gun to clean the dirt inside the wheel hubs, and during maintenance, we pay special attention to the sensor connectors. It’s been effective—no issues for a year now. If the same sensor keeps failing repeatedly, it’s worth checking the magnetic ring on the wheel hub bearing—it might be the culprit.

[SanJohn]

As an auto mechanic, I've dealt with numerous cases of Sagitar ABS sensor failures, which typically occur due to three main reasons. First is the quality issue of the sensor itself - aftermarket parts don't last, and even genuine parts have design flaws with inadequate sealing leading to water ingress and short circuits. Second is chassis wiring problems - the sensor connects to several wire harnesses that sway near the shock absorbers, and over time the insulation wears through causing shorts, especially with the right front wheel wiring being most prone to abrasion. Lastly, contamination of the gear tooth sensing area - brake dust mixed with mud accumulates on the magnetic ring, preventing the sensor from detecting wheel speed changes and triggering errors. The solution is straightforward: clean the magnetic ring, replace the wiring harness, and install a genuine sensor - addressing all three aspects usually provides a permanent fix.

[Vieira]

I believe the frequent failures of the Sagitar's ABS sensors are primarily caused by two environmental factors. First, the de-icing agents spread on urban roads during winter are highly corrosive, with salt penetrating the rubber sleeves and eroding the sensor circuit boards—a common chemical corrosion issue in northern regions. Second, the heavy rainfall in southern areas leads to water accumulation in the wheel wells, soaking the sensor connectors and causing pin oxidation and poor contact. My father-in-law's car suffered from this exact issue when driving through a deep puddle in the rain, immediately triggering the ABS warning light. The solution is to avoid submerging the wheels beyond half the height of the wheel hub, check the wheel well drainage holes after heavy rain to ensure they're clear, and apply anti-rust spray to the sensor connectors if necessary. Remember, never use a high-pressure car wash jet directly on the inner walls of the wheel hubs.

[DiEvangeline]

Repeated ABS sensor failures are mostly caused by bad driving habits. Many people like to use high-pressure water guns to rinse the inside of the wheel hubs, with the strong water flow directly impacting the fragile connectors of the sensors. After a few times, the sealing rings deform and let water in. Others enjoy speeding through puddles to drift, allowing dirty water to flood the wheel wells and corrode the metal terminals. My friend's Sagitar had this issue—every time he went off-road, the sensor would fail. After breaking these bad habits—using a low-pressure spray gun from 30 cm away when washing the car and slowing down when encountering puddles—the sensor hasn’t failed in three years. Also, when installing a new sensor, pay close attention to the alignment angle. Improper installation can cause signal reception issues and lead to premature failure.

[FrankMarie]

From the perspective of circuit principles, the root cause of frequent sensor failures in the Sagitar is voltage overload. The fuse in the engine compartment's power distribution box has a rated current that is too low, and the instantaneous current during wheel hub motor startup is excessively high, leading to the breakdown of the sensor circuit board chip. This issue is particularly noticeable when upgrading to high-power lights in new cars. My neighbor's modified Sagitar experienced this—after upgrading the lights, the front wheel sensors would fail within three months without fail. Additionally, a faulty generator regulator causing voltage to spike above 15 volts can directly burn out the sensor wiring. The solution is straightforward: use a multimeter to check if the supply voltage remains stable at 13.5 volts and inspect whether the corresponding 15-amp mini fuse for the ABS in the fuse box has blown. If voltage instability is detected, promptly examine the generator's carbon brushes and voltage regulator.