Samples of Oxygen Sensor HDS Plots For Accent, Elantra, Tiberon

^ This sample plot shows a typical front and rear oxygen sensor at 2500 rpm for Accent, Elantra or Tiburon.

^ The front signal is a fluctuating signal that changes from 0.84 to 1.49 V, while the rear signal remains constant. (Note the 0.70 V signal offset).





^ 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.)





^ 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.)

^ Both sensors should always react lean when introducing a vacuum leak unless the vehicle has low mileage or a new catalytic converter.