How Many 2005 Elantra O2 Sensors - Hyundai Forums : Hyundai Forum
 
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#1 Old 02-05-2011, 02:33 PM
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twalling71
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How many O2 sensors are there on a 2005 Elantra GT? I found one right up front on top of the catalytic converter, I believe. I couldn't see another one. I need to replace it to pass emissions testing and I think I could do it myself if that's the only one there is. If there are more than one, I don't know which one to replace or where the other one is. I know, I know... I need to get a repair manual.

Thanks for any insights.

ZV
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#2 Old 02-05-2011, 06:57 PM
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QUOTE (ZekeVoltage @ Feb 5 2011, 02:33 PM)
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How many O2 sensors are there on a 2005 Elantra GT?

The correct answer is (2)... pre-cat for fuel trim purpose, and post-cat to monitor catalyst efficiency --> SEE PIC

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#3 Old 02-05-2011, 07:57 PM
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twalling71
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Ahhhh. That was helpful. For multiple reasons, I see now that I need to take it in:

1) i don't have a ramp and don't trust my jack to get under the car.
2) I'd have to trial-and-error my way through figuring out which sensor to replace.
3) I've never done this type of repair before and I don't want to mess it up.
4) I also have another sensor (I can't remember which one it is, cuz I lost the DOL report) that needs replacing anyway.

Cool. Thanks.
ZV
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#4 Old 02-08-2011, 10:55 PM
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QUOTE (sbr711 @ Feb 5 2011, 06:57 PM)
Quote:
The correct answer is (2)... pre-cat for fuel trim purpose, and post-cat to monitor catalyst efficiency --> SEE PIC

2 is right. If you have never done it before, it might be a bit tricky. Alot of force is required getting them out (as sealant might have also been used) but if you are too rough, it damage other things. Usually you need a torch to heat it up real good before replacing it, and re-applying sealant.

@SBR, is that the front or rear O2 sensor? Would you be able to post a picture of where the other would be? Im guessing the positioning would be the same for a '02 Elantra.
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