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If any of these sensors are malfunctioning, the "Check Engine" light may come on inside the car, or the engine may run roughly. Mechanics can pull codes for many of these sensors to help solve the problem.

A. What is "pull codes"? B. Mechanics here is a single noun or working people?

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to pull codes means to download error codes from the computer memory.

mechanics refer to those working people that repair mechanical devices.

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A. "pull" = transitive verb, meaning "get information from" (the car's computer)
"codes" = plural noun, meaning "error codes" (such as numbers, that can be used to look up error descriptions in a table.)

B. "Mechanics" = plural noun, meaning "people who build and/or fix machines".

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