So i took my car ('02 avant 1.8t) in to my mechanic just to get an oil change and have him check out the car since i just purchased it a few weeks ago. He said everything looks fantastic, but scanned for codes and these came up, there was never a CEL on.

P0118- Engine coolant temp circuit high input.
P1602- Power supply B + terminal 30 low voltage
P1114- Bank 1 Sensor 2 resistance too high
P1136- Long term fuel trim bank 1 too lean.

I trust him, and he says that its really no big deal, but i always like feedback from AF on things, so.......
What do these codes even mean, and is it something i need to worry about/get fixed soon?

 

bump

 

P0118- Engine coolant temp circuit high input. Clicky
P1602- Power supply B + terminal 30 low voltage Clicky
P1114- Bank 1 Sensor 2 resistance too high Clicky
P1136- Long term fuel trim bank 1 too lean. Clicky

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