On automatic transmissions the accumulator cover can leak due to failed o-rings. Replacing the o-rings and cover will address this issue.
Car problem reports
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Most reported 1999 Honda Passport problems
Certain models may have a vibration issue at highway speeds that could be due to uneven tire pressures, tire rim out of specs, wheels out of balance, AC compressor bracket bolts not torqued correctly, misalignment of the steering shaft coupler, improper ride height, or wheel alignment out of adjustment. A qualified technician is needed to sort out these problems and correct them.
A broken hatch button can cause the rear hatch not to open when you push the release button. Replacing the button should repair this issue.
On some models, the right motor mount cover can hit the chassis and cause a vibration at idle. Replacing the motor mount will repair this issue.
On some models the rear wire harness for the ABS system can fatigue and break causing the ABS light to come on. Replacing the harness with a new updated harness from Honda repairs this problem.