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Re: a 2006 sonata 4 cyclinder does it have a timing belt...
If it is a chain then no it does not need to be changed. I would call the local dealer and give them the vin# to make sure 100% if it is a chain or a belt. Achain does have guides made of plastic that you may want to think about along with the tensioner. Good luck.
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Pretty sure it has a timing belt and you should replace it at around 60,000 miles they are designed to last a lot longer but to be safe replace every 60,000 as well as the water pump and idler bearings
My rule of thumb for Timing belts: replace at 60,000 miles, and every 40,000 miles thereafter. Having said that, I often let cars go until the timing belt starts showing signs of wear (usually every 50K - 75K miles)
But www.autozone.com (register free at www.autozone.com) is recommending for your car driving in "severe driving conditions" (aka normal stop-start driving) that your 2000 Sonata have: 60,000 miles - replace 90,000 miles - inspect for wear 120,000 miles - replace 150,000 miles - inspect for wear
The 155 page owners manual (I found one at the link below - you may prefer to try Hyundai) makes no mention of the timing belt at all.
oil/filter/lube every 3,500 miles synthetic oils every 5,000 miles
tire rotation wheel align check balance every 7500 miles
transmission service every 30,000 miles
air filter gas filter cabin air filter evry 30,000 miles
if engine has a timing belt(rubber substance) replace every 60,000 miles if it has a metal timing chain lasts almost forever
spark plugs should be good for 75,000-100,000 miles before replacing
Spark plug wires every 50,000-60,000 miles approx.
fuel injector flush every 30-40,000 miles approx.
timing chains should only be changed if there is noise or problem in that area. if it has a belt most belts need to be changed at 60,000 miles and some at 100,000. Engine damage may occur in many engines run with a timing belt that breaks.
Most car manufacturers recommend replacing timing belts after 60,000 miles. I have seen cars go 200,000 on a timing belt. But I wouldn't recommend that. Personally, that Max I would go, even if 99% of your driving is highway, is 80,000 miles. I'm not 100% sure about the sonata, but if it is front wheel drive and your replacing the timing belt, think about replacing the water pump at the same time. That is always good practice to remember.