OBDII = on board diagnostics. It a computer-like systemt which records the malfunctions as a code so that we can diangnose what and where the problem is. The ODBII scanner is plugged in the pin socket under/near the steering wheel. The scanner reads the code to determine what the problem is (eg. what's causing the CEL light to be on).
CEL = check engine light
Thats all i know. Someone help clarify if i got any of the info mixed up
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