Question about 2001 Hyundai Sonata
The upper O2 sensor is located on the exhaust manifold/s, and the rest is down the line. Some Vehicles have 2, 3, etc. The Upper O2 reads and helps control air/fuel mixture, the lowers usually monitor emissions, and Catalytic converter efficiency.
Posted on May 01, 2010
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Posted on Jan 02, 2017
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