One problem related to fuel injector has been reported for the 2003 Hyundai XG350. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Hyundai XG350 based on all problems reported for the 2003 XG350.
My vehicle has been having a hesitation problem for some time now. I have taken it to several mechanics and have not found the problem after spending several thousand dollars. I took it to the local dealer (brown Hyundai) in laredo TX and they point to the catalytic converters (3) and the oxygen sensors. I have had a mechanic remove the catalytic converts and tell me there is nothing wrong with the converters. The vehicle exhaust system reaches over 500 degrees. I have measured it with a heat gun. While I do not know what the proper temperature should be I know over 500 degrees is way to high. While I went to pick up my Hyundai at the dealer he told me they had just had 2 other vehicles Xg350's with the exact problem. If you go on line and read some of the codes they refer too "band 1 and bank 2 system too lean", this is a very common problem without an exact solution. I believe the code is p0174 and p0171. Both the mechanics I have hired and the dealer have checked the list of possible problems which include: intake air leaks oxygen sensors ignition misfiring fuel injectors fuel pressure mass air flow sensor.