Before you do anything, get the codes checked.
It's also a good idea (as the others have suggested) to use a fuel system/injector cleaner regularly. I regularly used Chevron's Techron Fuel System Cleaner for a while (probably one of the best widely available fuel system cleaners). Then I switched to Redline's, now I use AMSOIL's. For fuel additives, Redline's is the most concentrated in detergent and ability to clean deposits (and most expensive). To give you an idea, Chevron's has 4% detergent/volume, AMSOIL's 32% and Redline's 34%. Anything stronger and you'll have to run it directly through the fuel rail bypassing the fuel pump (i.e. unplug the fuse for the fuel pump and attach the can directly to the fuel rail as opposed to pouring it into your gas tank). This stuff has about 40-45% detergent/volume. In any case, follow the directions. Leaving a fuel additive in your gas tank longer and in higher concentrations than engineered causes crazy *hit to happen in your car.
And because of the cleaning ability of the AMSOIL, Redline and other fuel additives, they can actually dislodge enough deposits that when they get burned up, they set off warning lights.
But once again, get the codes checked first.
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