My car hundai accent 2002 gl shows check engine sign. had it checked. shows code p1401. what is wrong?

Change the rear oxygen sensor on the exhaust system.

location of oil pressure sensor on 02 hyundai accent gl with a 1.6 liter engine is driver side front of engine. lower near the bottom of the radiator.mind you that is for a 1.6 l

P0734 = 4th gear incorrect ratio (that's the torque converter 'lock-up' clutch - inside the converter).
P1401 = doesn't exist for 2002 Hyundai Accent's
P1401 exists for 2000 Accent = DM-TL Air Pump Motor Curent Draw is higher or lower than expected (normal is 17-36 mA). DM-TL = Diagnostic Module for Tank Leakage & is part of the Evaporative Emissions Control System.

These two DTC's are not associated/part of the Accent's Engine Managemenet System (EMS).
Best to have a qualified/certified Hyundai Service Technician properly diagnose this starting problem with your vehicle.

The 2000 model year Accent adopts a different "pressurized" leak check system capable of detecting a 0.020" (0.5 mm) diameter leak (previous Hyundai systems detect a 0.040" [1mm] diameter leak using engine vacuum). The new system uses a Diagnostic Module for Tank Leakage (DM-TL) to close and pressurize the fuel evaporative emissions system. The DM-TL replaces the fuel tank pressure sensor and the canister close valve from previous systems. Other significant changes were made to the system logic, including several new diagnostic trouble codes. It compares the differences between the 2000 model year Accent and previous evaporative emission systems... Que puede ser? Tiene dos opciones. Primero, puede pagar que un tecnico diaga el problema (exactamente) o sigue, secudariamente, su adivnaza.

Diagnostic: "module Tank Leakage (DMTL) Failure"

Probale cause:

1) Open Or Short Circuit Condition

2) Poor Electrical Conection

3)Faulty DMTL Module Faulty



Read more: http://wiki.answers.com/Q/What_is_a_p1401_code_on_a_2002_hyundai_accent#ixzz1Ep0tl2tO Call your service dept on the phone as I have heard they dont use the code...better call dealership for free and find out. Hoped I helped you in the right direction

CODE P1401 IS FUEL TANK LEAKAGE DIAGNOSTIC MODULE SYSTEM MALFUNCTION.

P1401 - DM-TL air pump motor current draw is higher or lower than expected (normal = 17-36 mA).

This is an electrical issue with the pump, it's not related to a leak in the evaporative emission control system.

most likeley on the emission sticker on the hood, or stamped in a plate on the fire wall

00-30-001 2000 ACCENT DMTL DIAGNOSIS: DTC CODES P1401, P1402 AND P1403

p1402 - dm-tl air pump motor is shorted or disconnected.

2000 model year accent is equipped with a new enhanced evaporative emission system. this new system is capable of measuring leaks as small as 0.020" diameter. the new system pressurizesthe evaporative emission system with a diagnostic module for tank leakage (dm-tl), while the previous model's system appliedengine vacuum through the purge valve to detect system leaks.

service information
vehicles that have the check engine light illuminated and have dtc p1401, p1402 and p1403 stored in the ecm should have their electrical systems diagnosed related to the appropriate dtc. these codes are not related in any way to an evaporative emission system leak. the conditions that set the diagnostic codes areas follows:
p1401 - dm-tl air pump motor current draw is higher or lower than expected (normal = 17-36 ma).
p1402 - dm-tl air pump motor is shorted or disconnected.
p1403 - dm-tl changeover valve is shorted or disconnected