I went to polution test site. Codes P0133 and U0D00 came up. I think the first code is an O2 sensor.

2001 HYUNDAI ELANTRA
140,000 MILES
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CJMY2K@AOL.COM
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But I don't know what the second code is. Can you help ? I have replaced 2 new Bosch O2 sensors from Autozone but the P0133 keeps popping on a few days later. Now after going to the test site, they say give me the second code U0D00. Can you help ?
Mar 21, 2012 at 3:48 AM
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MERLIN2021
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Any u code means one or more modules are not comnunicating on the data lines. These are called twisted pair wires, as they are actually two wires twisted around each other. Hyundai service should be able to tell you what your code is, but without the right test equipment, tracking down what mods are involved will be near impossible.
Mar 21, 2012 at 2:56 PM