How and Why Could a Vehicle Fail an OBD Test

question 30

Essay

How and why could a vehicle fail an OBD test but pass a tailpipe emissions test?

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Definitions:

Pairing

The process of associating two events or stimuli together, often used in conditioning wherein a neutral stimulus becomes associated with a meaningful one.

Generalization

The process of applying the outcomes of specific instances to broader situations or populations, often seen in learning and reasoning.

Conditioned Response

A learned response to a previously neutral stimulus that has become associated with an unconditioned stimulus through conditioning.

Extinction

In behavioral psychology, the process through which the conditioned response is weakened when the conditioned stimulus is repeatedly presented without the unconditioned stimulus.