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

700

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
705

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

Add photo

Related Questions

Sonata

Looking for a Used Sonata in your area?

CarGurus has 49,609 nationwide Sonata listings starting at $700.

ZIP:

Search Hyundai Sonata Questions

Hyundai Sonata Experts

#1 toDumbToNotKnow
toDumbToNotKnow
Reputation 1,280
#2 Tom Demyan
Tom Demyan
Reputation 1,150
#3 dandyoun
dandyoun
Reputation 920
View All

Related Models For Sale

Used Honda Accord
1,210 Great Deals out of 77,539 listings starting at $969
Used Toyota Camry
1,476 Great Deals out of 99,922 listings starting at $700
Used Hyundai Elantra
905 Great Deals out of 52,842 listings starting at $1,799
Used Kia Optima
559 Great Deals out of 29,862 listings starting at $2,000
Used Nissan Altima
1,095 Great Deals out of 85,190 listings starting at $695
Used Honda Civic
1,188 Great Deals out of 65,343 listings starting at $1,500
Used Chevrolet Malibu
1,103 Great Deals out of 79,336 listings starting at $2,495
Used Hyundai Santa Fe
402 Great Deals out of 14,652 listings starting at $1,000
Used Toyota Corolla
1,358 Great Deals out of 67,632 listings starting at $100
Used Nissan Maxima
421 Great Deals out of 25,112 listings starting at $1,500
Used Mazda MAZDA6
216 Great Deals out of 14,414 listings starting at $1,995

Used Cars For Sale

2017 Hyundai Sonata For Sale
22,558 listings starting at $14,891
2016 Hyundai Sonata For Sale
77 Great Deals out of 5,838 listings starting at $11,990
2015 Hyundai Sonata For Sale
207 Great Deals out of 4,428 listings starting at $9,985
2014 Hyundai Sonata For Sale
105 Great Deals out of 2,281 listings starting at $8,491
2013 Hyundai Sonata For Sale
286 Great Deals out of 5,461 listings starting at $5,488