Accent GL Sedan L4-1495cc 1.5L SOHC MFI (1997)
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HDS Plot 4 shows a Sonata V6 at 2500 rpm when introducing a vacuum leak. The front sensor reacts lean immediately while the rear sensor reads
lean after a short delay.
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Both sensors should always react lean when introducing a vacuum leak unless the vehicle has very low mileage or a new catalytic converter.
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HDS Plot 5 shows a Sonata V6 at 4000 rpm drop to idle and the front sensor reads lean.
Note 1:
At 4000 rpm the front sensor signal may be rich until the vacuum leak is introduced.
Note 2:
Due to a different engine management system, the rear sensor may not react (lean) as it did with an Accent, Elantra or Tiburon with the same test (see
HDS Plot 2).
