Glossary “knock off hub” Definition:
A large, single, two or three eared wing nut used to retain a wheel; illegal for street use.

Glossary “knock sensor” Definition:
Sensor that signals the PCM when detonation is detected, momentarily retarding ignition timing until detonation ceases.

Glossary “knock off type CV joint” Definition:
An internal circlip CV joint retaining design.

Glossary “knock off” Definition:
1). A counterfeit. 2). A cheap auto part packaged to represent a popular brand.