HICAS Malfunction
Symptoms
HICAS warning light on the dashboard. Rear-end instability at speed, vague rear-end feel, or the rear appearing to steer independently of the front.
Cause
The R32 and R33 use a hydraulic HICAS system with a rear steering rack actuated by a hydraulic pump. Hose leaks, pump failure, and rack seal failure are common. The R34 uses an electronic HICAS system that is more reliable but still develops faults in the electric motor and sensor circuitry.
Fix
Many owners choose to delete HICAS rather than repair it.
A HICAS delete kit ($200-400) replaces the rear steering rack with fixed-length tie rods, eliminating the system entirely.
This is widely regarded as an improvement for spirited driving and track use.
If you want to retain HICAS, a full system overhaul costs $1,000-2,500.
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