One problem related to engine oil leaking has been reported for the 2001 Toyota Prius. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Toyota Prius based on all problems reported for the 2001 Prius.
Engine stalling occurring randomly while cruising at highway speed between approx. 54 to 64 mph causing vehicle to slow down on the freeway. This problem is potentially hazardous because engine stalls at freeway speed which could result in rear end crash from on-coming vehicles traveling behind at freeway speeds --- furthermore the vehicle must be stopped at the freeway edge to be restarted before problem is corrected. Restarting vehicle immediately corrects problem. However, this problem should be made a mandatory recall item. [prius scanner shows dtc code p1120 for accelerator pedal assembly problem and there is a manufacturer TSB concerning this problem (TSB eg018-02)]. This vehicle has had the crankshaft sensor replaced pursuant to the recent recall notice and the crankshaft sensor had been leaking oil prior to replacement. Also drivers rear axle hub bearing failed prematurely and was recently replaced.