Question about Hyundai Sonata

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I have a 2005 Hyundai Sonata. My Engine check light came on and I had it checked out it is my Bank 2 Sensor 1. I had it replaced a few weeks later the light came on again. I had it checked out again and it shows the same sensor. They said my sensor is fine, and it could either be my wiring or my computer is going out. They said they don?t know how to fix the problem because it?s a Hyundai and said to take it to the dealership. Dealership are expensive is their anything else I can do? Where is the computer?

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  • Jeremy W.
    Jeremy W. Sep 27, 2010

    what code specifically are you getting?

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Hopefully they replaced the correct sensor- bank 2 sensor 1 should be the upper (closest to exhaust manifold) on the radiator side of the engine not the firewall side.Who replaced it? did they monitor the data value? just because a code reader says O2 sensor bank 2 sensor 1 problem it can be a lot of items even a vacuum leak close by o2 sensor will set a o2 sensor code. maybe you should purchase a code reader that shows data so a person would know what information the computer is getting from the sensors. did you purchase a oem or equivalent or did you go to mr. cheapy's and buy a inferior sensor. There is a quality diff. between the cheap discount parts and quality parts that's why it's important to make sure the sensor is bad for sure before you replace it(quality sensor cost a little more).The fact that it is a hyundai is irrelevant. o2 sensors can be tested the same way on most makes/models-make sure the heater inside o2 sensor isn't shorted and ground is good induce vacuum leak watch sensors output should go low milli volts very fast, put vacuum hose back on watch output of sensor induce propane to air intake should go rich - high milli volts. under normal running at high throttle between 1200-1500 rpm should go high/low switch several times. this is a spec for the o2 sensors upstream #1on either bank. low .100 volt, high.900 you may see 1.200 volt on high side thats ok most important item is that when it goes into closed loop it switches regularly

Posted on Sep 27, 2010

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