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    Exam 4: On Board Diagnostic Scanners and Digital Storage Oscilloscopes
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    On an OBD II Emission Control System, Both Pre-Catalyst and Post-Catalyst
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On an OBD II Emission Control System, Both Pre-Catalyst and Post-Catalyst

Question 17

Question 17

True/False

On an OBD II emission control system, both pre-catalyst and post-catalyst oxygen sensors are used.

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