What could be the problem with a H02S11 and H02S12, in a 2003 Hyundai Accent?

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anonymous · Answer 1 · 2017-04-29T16:17:41+0000

If there is not damage to the exhaust system Bank 1 Sensor 1 and Bank 1 Sensor 2 might have to be replaced.

If you have an old ECM main relay I would start by replacing that, there was issue with the old one.

Hyundai Accent relay service bulletin