Looking at a 2000 hyundia accent but has a check engine light code of po447 is this a big problem

Code 170 means the computer can not adjust the fuel mixture by normal methods. Could be the O2 sensor, or a problem with the fuel injectors.

your check engine light bulb more likely blown.

1-3-4-2

Go to www.hmaservice.com and register your vehicle by VIN #..
you'll then have access to wiring diagrams, shop manuals,
service bulletins, illustrations, etc. To diagnose a 2000 or 2001 1.5L Accent Diagnostic Trouble Code (DTC) P1128 (FUEL SYSTEM LEAN -- PART LOAD), check the following:

• Check the intake system for air leaks.
• Check that the Mass Air Flow (MAF) Sensor (P/N 28164-22610) operation meets the specifications listed below. If the MAF sensor output is significantly lower than the reference value (10% or more), then replace the MAF sensor.

Table 1: Using the Hi-Scan Pro in the Hyundai Diagnostic Menus Current Data Screen TPS (%) 0
3.5
5.1
7.4
MAF (kg/h) 10
21
30
47
RPM IDLE
2000
3000
4000
Table 2: Using the Hi-Scan Pro in the OBD-II Menus Current Data Screen TPS (%) 0
3.5
5.1
7.4
MAF (g/h) 2.8
6
8.5
12.7
RPM IDLE
2000
3000
4000

WITH MANUAL TRANSMISSION

Table 3: Using the Hi-Scan Pro in the Hyundai Diagnostic Menus Current Data Screen TPS (%) 0
2.4
3.9
5.9
MAF (kg/h) 9.5
19.4
28.8
43
RPM IDLE
2000
3000
4000
Table 4: Using the Hi-Scan Pro in the OBD-II Menus Current Data Screen TPS (%) 0
2.4
3.9
5.9
MAF (g/h) 2.5
5.5
8
12
RPM IDLE
2000
3000
4000

I would check for any vacuum leaks. Also check the idle air control valve. Spray some Gumout around the vacuum hoses, if you get any change in idle, check for cracked or broken hoses. Check Engine Light on?

take the vehicle to auto zone or parts source and they will scan it for free

check under the washer reservoir. Probably accessible by under the front wing skirt.
Hope it will help
Dan

big red
if you have not had problems with your car the most probable thing is you need to replace your maf sensor you can also jut remove it and cleane it with alcohol then reset your cars computer by removing the positive cable from your car for about 2 minutes and placing it back it will clear the engine code

check the fuzes.

get new light bulbs