Ive had my 2003 hyundai sonata LX V6 for 4 months now that will not pass smog i have already received my 30 day permit and three 10 day permits i have took it to 3 different mechanics that cant seem to figure it out, there are no Check engine lights on, i have changed out my Throttle Position sensor,completed the drive cycle after that, my car Drives great no delays or problems but still keeps getting rejected at the smog check, the areas of reject are OBD fuel, OBD catalyst & OXY sensor, the mechanics say my sensors are good my gas cap is good and there are no known problems,my last resort would be to take it to the hyundai dealership,can anyone help me out?

Asked by Mar 12, 2015 at 06:31 PM about the 2003 Hyundai Sonata LX

Question type: Maintenance & Repair

2 Answers

850

Some vehicles won't run emission test unless the fuel level is at a certain point, if you fill the gas tank and then run it until it gets below 1/4 tank it should have run all monitors. Also, how many miles have you driven and do these mechanics reset the monitors each time they check it out?

Best Answer Mark helpful
945

car may have a bad piston ring and burning oil and making it not pass emission check if lite blue smoke come out tale pipe when pushing on the gas if lite blue smoke comes out might be rings or oil problem. i had almost the same problem found out the engine was burning oil i had 2 bad piston rings i had pistons and piston rings replaced and the problem went away. no saying that's the problem just had the same problem or engine may have a internal oil leak were to much oil is mixing with the gas.

Your Answer

Sonata

Looking for a Used Sonata in your area?

CarGurus has 50,607 nationwide Sonata listings starting at $1,995.

ZIP:

Hyundai Sonata Experts

  • #1
    toDumbToNotKnow
    Reputation
    1,600
  • #2
    Tom Demyan
    Reputation
    1,340
  • #3
    dandyoun
    Reputation
    1,100
View All

Related Models For Sale

Used Hyundai Elantra
474 Great Deals out of 46,762 listings starting at $795
Used Honda Accord
984 Great Deals out of 59,479 listings starting at $1,099
Used Toyota Camry
915 Great Deals out of 81,893 listings starting at $999
Used Kia Optima
380 Great Deals out of 30,219 listings starting at $1,900
Used Nissan Altima
982 Great Deals out of 77,958 listings starting at $1,695
Used Honda Civic
763 Great Deals out of 69,170 listings starting at $1,350
Used Chevrolet Malibu
943 Great Deals out of 65,142 listings starting at $1,995
Used Toyota Corolla
776 Great Deals out of 54,488 listings starting at $1,500
Used Hyundai Santa Fe
250 Great Deals out of 16,125 listings starting at $1,475
Used Nissan Maxima
257 Great Deals out of 22,758 listings starting at $1,400
Used Mazda MAZDA6
192 Great Deals out of 10,785 listings starting at $1,250
Used Chevrolet Impala
539 Great Deals out of 35,140 listings starting at $900

Used Cars For Sale

2018 Hyundai Sonata For Sale
24,671 listings starting at $16,067
2017 Hyundai Sonata For Sale
77 Great Deals out of 3,836 listings starting at $10,995
2016 Hyundai Sonata For Sale
91 Great Deals out of 4,132 listings starting at $8,999
2015 Hyundai Sonata For Sale
187 Great Deals out of 5,410 listings starting at $7,995
2014 Hyundai Sonata For Sale
111 Great Deals out of 2,585 listings starting at $6,756

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.