What is the solution? P0121 The TPS has been replaced.?

The P0121 codes from Auto Zone read as follows: Definition: BBTPS/Pedal Position sensor / Switch "A" circuit BBrange / Perfomance Probable Cause: BB1: Poor Electrical Connection (How to fix this? Proper Tune Up?) BB2: Open Or Short Circuit Condition (How to fix this? Proper Tune Up? Oil... show more The P0121 codes from Auto Zone read as follows:

Definition:
BBTPS/Pedal Position sensor / Switch "A" circuit BBrange / Perfomance

Probable Cause:
BB1: Poor Electrical Connection (How to fix this? Proper Tune Up?)

BB2: Open Or Short Circuit Condition (How to fix this? Proper Tune Up? Oil Change?)

BB3. Faulty TPS (It was replaced 3 days ago. Was it replaced wrong?)

BB4: Faulty Pedal position Sensor (How do I order this brake switch to replace it? What is it called? A brake switch?)
Update: Its a 98 Hyundai Elantra 1.8L 4 cyl. There is no part called a 'Pedal Sensor' for the year Hyundai. There is a break switch? Is that what needs to be replaced?
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