I have a Hyundai Sonata 2000 had fail Nox emission (Gross Polutted).
The car has no Check Engine Light on. But I found there was 2 DTCs
Code from OBDII that were
P0134 Oxygen sensor circuit No Activity.
P0154 Oxygen sensor circuit No Activity.

I looked up under Hyundai Diagostic book and it said (Check for
Contaminated or crossion). I did replaced both upstream Oxegen sensor
before CAT, and the code are still there.

I even check the voltage from the oxygen connector, but did not get
anything.

Do you have any ideas how to fix it?.


Bao

 

There is a recall on this issue. Call your Hyundai dealer with vin in hand
and ask them to check for open recalls. I banking you have an open recall
v01, which covers replacement of old design upstream oxygen sensors and
reprogramming the ecm.

Also, the dtc's won't go away for quite some time unless they're erased.

Third, I wouldn't necessarily think this would solve your emissions
problems.

 

Thank you very much for this information.

Bao

 

I had the same problem. In fact I have had 5 oxygen sensors replaced on my
2000 Sonata, including those with the recall. By the way, looking at the
Consumer Reports for this model, electrical is not a strong point, especially
power equipment--I have had all 4 window motors go out as well as the power
mirrors. I have a few more months before I am paid off, and wonder if I should
stick with Sonata or move up to a larger model. Anyone have a suggestion?

Thanks,

Steve