It could be design flaws or inferior replacement parts, or poor
workman ship from workshop.
Sonata taxi is diesel and hence no HT wire for spark plugs so
less one speculation.
Possibilities:
1) poor fuel fittings due to inferior parts that causes leaking
during high pressure.
2) Converter over heated????
3) Electrical wiring of wrong gage and wrong routing????
4) First and foremost: Inferior replacement parts and poor
workmanship by in-house workshop.
It must be burning wire (either overload or short-ciruited) or
leak fuels that is near exhaust pipes or onto wires.
Could be MFG design flaws or Taxi Co trying to save cost and
poor workman-ship.
Good Luck if this problem persists.
