NHTSA Complaint #10548755 — 2003 HYUNDAI 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. *TR