Question about 2001 Hyundai Sonata

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I have a 99 Hyundai SOnata....the check engine came on once lafew weeks ago...i put new oil and refilled my gas tank. Two days later the light went off..two days ago it came back on....car is hesitating upon any acceleration...such as...red light, pulling out of a parking spot....HELP!

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  • Hyundai Master
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Please see my tip at http://www.fixya.com/cars/r5932051-check_engine_light_check. These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Oct 01, 2010

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Posted on Jan 02, 2017

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4 cylinder hyundai sonata rough idle, check engine light on already changed gas cap


May just be dirty gas...how long since tune up? Try 1-2 bottles of Lucas Oil Injector cleaner added to gas tank, do you know how to clean the throttle body...check for clogged/dirty air filter too...Hope this helps.

Oct 23, 2015 | Hyundai Cars & Trucks

1 Answer

I had my 2006 Hyundai Sonata serviced two days ago. Had front brakes pads replace, power steering flushed, replaced front valve cover gasket and replace spark plugs, engine filter changed. Car drove fine...


that is just a basic 10,000 km service
check engine light on
undo battery terminals count ten reconnect
clears the codes
if check engine light returns
the code will be stored in the ecu

description sounds like an 02 sensor

Mar 30, 2017 | 2006 Hyundai Sonata

1 Answer

Check engine light/evap leak


Getting a smoke test is the right direction to go in.
The computer vents the gas tank to the vapor canister while the engine is running. It also pressure tests the system for leaks. Some where between the gas tank and the vapor canister there may be a leaking hose or valve. Or it could be the gasket on top of the tank where the pump assembly went in.
The gas cap could have been a source for the leak, the other things are not involved.

Apr 24, 2013 | Oldsmobile Cars & Trucks

1 Answer

I have a 96 cadillacsls that is over heating- no leaks but it is pouring out the over flow tube?


Did you over heat warning message come on " Urgent shut off engine" or check coolant message? My coolant message came on but once car warmed up, it was late summer. No leakage but coolant level was low; added some coolant. Then it happened again but once car warmed up the check message disappeared. Then a few days later I got the Urgent Shut off Engine message! Thankfully I was able to pull off road and shut down immediately. Had it towed to Caddy shop. My water pump had gone out. New Pump and replaced all hoses. Then a year later check coolant light came on again, once car warmed up, light went off. This time tho a small leak in the radiator. My husbank put in a new radiator. Car has 117K miles and a few weeks ago outside temp 35, running late for work and didn't allow car to warm up but just a minute or two and when I puled away the check coolant light came on; but once the car warmed up (temp gauge needle in center) the light went out. Being the car is 17 years old I try to treat her like a baby and not push her so I do let the engine warm up before driving away. Do you have to add oil between oil changes? This is normal for the Northstar engine; your regular garages or full service stations don't know this; also make sure if you aren't using an authorized Cadillac garage that they put the right amount of oil; they want to put less than what is required. Not sure if this is really a solution more comments than anything... :)

Feb 01, 2013 | 1996 Cadillac Seville SLS

1 Answer

Have an 05 sonata, 4 cylinder. tach started dropping out or being erratic. few weeks later check engine light came on. Several codes pop up (p300,302,303,304,320). Still runs, gas mileage took slight hit....


Take it to an AutoZone or an Advance Auto Parts and ask them to read the codes. My guess is that your ECU's gone bad or may need resetting, which is something the dealership may need to do.

Aug 31, 2012 | 2005 Hyundai Sonata

1 Answer

2 weeks ago i had oil changed. The next day, MIL came on. I added some fuel and later that same afternoon, MIL went off. Two days ago, MIL back on. Added transmission fluid, MIL went off. Yesterday, guess...


Check engine light has to be scanned to see what is causing it. The problem causing it is probably stored in the car's computer. Get it scanned at autozone or a similar place, they usually do this for free. Not likely a CEL would be thrown for fluids being low.

Jul 23, 2011 | Hyundai Tucson Cars & Trucks

2 Answers

Cant fill up gas 2002 hyundai sonata


have emission system checked or buy manual and perform test

Sep 19, 2009 | Hyundai Motor 2002 Sonata

1 Answer

Check engine light stays on.


You've made the correct decision. Let the dealership diagnose the issue. They'll tell you EXACTLY what the problem is and what's needed to fix it (parts, labor, tax, time-frame, etc.).

Jun 04, 2009 | 2006 Hyundai Sonata

1 Answer

Engine light on in Hyundai Sonata


might have a oxygen sensor that went bad, take it to advance auto the trouble shoot for free

Aug 27, 2008 | 2005 Hyundai Sonata

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