At random moments, I get total loss of power for 2-3 seconds, then it comes back. really seems like the engine is shut off. I got these codes from vagcom but could someone tell me what these codes are ?

16487 P0103 Mass or Volume Air Flow Circuit - High Input.

17645 P1237 Cylinder #1 Fuel Injector Circuit - Open Circuit A
17646 P1238 Cylinder #2 Fuel Injector Circuit - Open Circuit A
17647 P1239 Cylinder #3 Fuel Injector Circuit - Open Circuit A
17648 P1240 Cylinder #4 Fuel Injector Circuit - Open Circuit A

I was thinking a bad MAF (first code) that triggers the four other codes when it acts up.. ?

thanks

 

Check the fuel pump relay "J17"! The fuel pump relay provides power to the fuel pump, power for the injectors, and power for the maf sensor. If it's an intermittent relay problem it will be hard to just check so since it's cheap, just replace it and see what happens. If the injectors loose power, the computer see's nothing and throws "open circuit" codes. Would get the same code if you just unplugged them. Same goes for the Maf.