Obd2 code po172 on a 2004 hyundai elantra what is probable cause ? and whats needed to fix it/

Probly not..sensors should only b replacd if heating element bad. Changing other items must b done w caution unless theyr cheap. A scan w a vehicle specific or factorytool will direct u whats occuring. Only honest private shops havthem. Partstore scanners dont suffice

Hello Rene,My name is Andy and i am going to help you solve your problem i need you to go to the closest place to connect the OBD2 which is a port of communication between the cars computer and the obd2 reader if you have i code with the speedsensor this can be the problem normally this sensor is located on the transmission or if it is not throwing any code you just need to replace your cluster .....

Have to Google the Code for your car, to see what it is,
& read several blogs to see what others do


Type: 2001 Hyundai Elantra OBD2 Code PO456

That is because the check light indicated on OBD2
System Fault

You replaced a part based on the code

The codes are used to diagnose the system that set
the code & then component test

You apparently didn't diagnose the real cause of the
possible problem

The sensor may have been just doing it's job

When you come here either give use the codes or
just Google them to learn the ins & outs

you can get a cheap obd2 code reader to check what problem caused the light on.

EVAP purge/vent solenoid circuit condition. the PCM has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in the evaporation emission control system (EVAP)

Most parts stores will sell you a code reader and it is just that .. it will give you the code and a brief and most times poor description . To use OBD2 to diagnose a problem you will need a scanner capable of live data stream which are expensive and not worth the money to the average person.

For the handyman , a code reader will do fine for being able to tell what the code number is if you have access to the repair information.

go to autozone n use ther OBD2 for free and haynes repair manual has all the codes.

if it is a generic obd2 system then it should be a p code p2626 O2 Sensor Pumping Current Trim Circ/Open Bank1 Sens1

P0441 is evap system insufficient purge. It means that the computer thinks the purge control valve isn;t operating properly. The fuel tank pressure sensor can send faulty info causing code to set but most of the time it is just the purge valve that needs replaced