A vehicle with an active air suspension system is exhibiting a consistent pull to the left, and the left front ride height appears to be slightly higher than the right front. A technician attempts to recalibrate the ride height sensors, but the issue persists. Which of the following is the MOST likely cause?
- AA seized front left lower control arm bushing
- BA faulty air compressor check valve
- CAn improperly adjusted or faulty front left ride height sensor
- DA slow leak in the right front air spring
Show answer & explanationAnswer & explanation
Correct answer: C. An improperly adjusted or faulty front left ride height sensor
A consistent pull to one side, combined with an incorrect ride height on that same side, strongly points to an issue with the ride height sensor. If the left front is reading too low, the system will overinflate it, causing it to sit too high and consequently pulling the vehicle to that side (due to altered alignment angles, particularly camber). Even after recalibration attempts, if the sensor itself is faulty (e.g., internal damage, bent linkage), it will continue to provide incorrect data.
Why the other options are wrong
- A. A seized lower control arm bushing could affect ride height and alignment, potentially causing a pull, but it's less likely to cause a 'slightly higher' ride height than a sensor issue in an *active air* system that relies on sensor input.
- B. A faulty air compressor check valve would typically affect the entire system's ability to hold pressure or inflate, not cause a localized high ride height and pull on one side.
- D. A slow leak in the right front air spring would cause the right front to sag, making the left front appear relatively higher, and would cause a pull to the *right* (the sagging side), not to the left.
Ride Height Sensor Malfunction
Failure or miscalibration of the sensor that measures the vertical distance between the chassis and the wheel, providing critical input for active suspension systems.
- Causes incorrect ride height on affected corner.
- Can lead to vehicle pull due to altered alignment.
- Often requires recalibration or replacement.
Memory trick: When the car 'LEANS' and 'PULLS', the 'SENSOR' is probably lying about its height.