Question about 2003 Kia Rio

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I went to dealership to have catillitic converter and o2 senor replaced, after service the check engine light came on again and the mechanic said that the replacement of the catillitic converter could cause more issues after it is replaced and cause the other o2 sensor to need to be replaced. Is this true? Or did they just replace the wrong sensor!

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  • vanessascarp Jul 29, 2010

    originally the check engine light was on, dealership said the catillitic converter needed to be replaced. I then went to emissions hoping to squeek pass and get my tabs but inevitably failed. The problem the emissions said was the catillitic converter and a slow o2 sensor, bank 1 sensor 1 to be exact.
    After servicing the catillitic converter and replacing the o2 sensor, when the check engine light again came on we checked the code with a meter and again it was bank 1 sensor 1 that was the explanation for the code. ??? I am thinking they replaced the wrong o2 sensor.



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Do you have a copy of the service invoice?
play dumb on the invoice the part number of the sensor should be noted. With that number in hand call an other dealerships parts dept.
give them the vin# of the vehical and ask if they have the heated oxygen sensor bank 1 sensor 1 ?. ask for the part number and compare to invoice. Problem defective converter can overheat and damage the sensor. A slow responding sensor can also be caused by tuneup related problems. Vaccuum leaks, misfires,an engne not reaching operating temperature. Having a code for bank 1 sensor 1 doesnot ness mean the sensor is bad. Sounds like the dealership missed the diagnosis

Posted on Jul 30, 2010

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Ask him to show you where the lambda probe is situated(the o2 sensor)(1/2 way down the front exhaust pipe before the cat box)and then ask to see the second o2 sensor(it aint got one,unless you have a V6 MOTOR,THEN YOU HAVE ONE FOR EACH BANK)he is right in saying that it will show up any fuel/timing/injector problems but these will show up on the diagnostic computer that he will have,otherwise how can he say the cat needs replacing etc.....
without a diagnostic computer NO ONE can say exactly what needs replacement.unless its obvious.

Posted on Jul 29, 2010


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