It can actually depend on the type of vehicle you drive.
If you Google 'Error code 30 Toyota' (or whatever car you own) you will find them.
Error codes are not the same across different vehicles
Don't know why it didn't list my car make but the codes are off of a 1995 ford contour.
The reason of Ford Contour B1721 OBD-II Engine Trouble Code is B1721 Seat Driver Rearward Switch Circuit Failure.
Code 521 - 530: Testing and Inspection
521 - 528
NOTE
KOEO refers to Key On Engine Off (KOEO)
KOER refers to Key On Engine Running (KOER)
Code 30 ford contour over heats trouble code 30 & 4095 wont over heat with inside heat on
Read more:http://www.justanswer.com/ford/0ceih-95-...
It seems to be that the heater doesn't work properly .. maybe an airpocket in it..
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