Sonata GL V6-3.0L (1997)
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HDS Plot 2 shows a typical Accent, Elantra or Tiburon with the throttle released from 4000 rpm. After a short delay both sensors react and indicate
the mixture is "lean". (Note the 0.70 V signal offset.)
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HDS Plot 3 shows an Accent, Elantra or Tiburon at 2500 rpm when intentionally introducing a vacuum leak. The front oxygen sensor reacts lean
immediately while the rear reads lean afier a short delay. (Note the 0.70 V signal offset.)
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Both sensors should always react lean when introducing a vacuum leak unless the vehicle has low mileage or a new catalytic converter.
Samples of Oxygen Sensor HDS Plots For Sonata
