ODB CODES

I have the obd code P0128 and P1133 in my 2001 accent.. I need someone to tell me what kind of troubleshooting do with these codes, I have the scanner but i need a program or somebody that can help me with the
definition of the codes.
In the P0128 code it says that the temperature is too low. I change the termostat and the light came back again in a couple of days, im thinking of changing the coolant sensor. Everything is ok, the fan is working , the coolant fluid is new and the temperature is good also. Any other thing that you guys think could be?
In the P1133 code it says something about the oxygen sensor, Maybe it needs to be replaced?
Any help would be great ,thanks.
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P0128 means that it takes the car too long to reach operating temperature. This could be caused by a stuck open thermostat, or one with too low a temperature rating (so be sure you installed the proper temp thermostat). It could also be caused by excessive resistance in the temperature sensor circuit. This is a rare code on this car. Any chance you got the codes partially mixed up (see below)? P1128 is a common code for 1.5L accents of your vintage, usually due to a defective air flow sensor.
I don't find any information regarding P1133 for this vehicle. P0133 is a common code for the front oxygen sensor. Before attacking the oxygen sensor, check the flex pipe for exhaust leakage. If it's leaking, fix that first.
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Thanks for quick the reply, I have some questions now: I am really sure that the thermostat is the right one, is the original, So maybe is the coolant sensor? You write something about the air flow sensor, this has something to do with the temperature on the motor? That is sensor located next to the air filter to the throtle body?
On the other code (P1133) i check everything and there is no leak on the exhaust so you think is a deffective oxygen sensor?
Thanks..
hyundaitech wrote:

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"I am really sure that the thermostat is the right one, is the original, So maybe is the coolant sensor?"
I'm a little confused-- you say the theremostat is original, but in your earlier post you say you replaced it. If you mean that you replaced it with a dealer supplied part, that should be good.
"You write something about the air flow sensor, this has something to do with the temperature on the motor?"
No, the air flow sensor has nothing to do with the temperature of the motor. I suggested this because I couldn't find any evidence that P1133 was a valid code and suspected you may have mixed your codes up, that is had P1128 and P0133. If you have no code P1128, there is no need to check the air flow sensor.
"On the other code (P1133) i check everything and there is no leak on the exhaust so you think is a deffective oxygen sensor?"
No. If you are actually reading a P1133, then I cannot provide any help because I have no indication that Hyundai uses P1133 on any vehicle. If you're really getting this code, you need to check to see whether your code reader is giving you the proper information.
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Hi: Thanks for the reply.
Your'e right, The thermostat that I replaced it was a dealer supplied part (original), and i compare both of them(the old one and the new one) and they are the same. So you think it could be the coolant sensor? On the P1333 Code, maybe it was P0133 Im not really sure right know, but it has something to do with the oxygen sensor. Supose it was P0133 and i check that there is no leak on the exhaust, you think it could be the oxygen sensor the problem?
Thanks for the reply.
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Since the thermostat was factory, my next guess would be the coolant temp sensor. But that doesn't mean it cannot be high resistance in the wiring or in one of the connectors.
If you've got a P0133 and no exhaust leaks, the problem is pretty much guaranteed to be the upstream oxygen sensor.
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Thanks for the advice, i'll keep you guys uptaded.
hyundaitech wrote:

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