Chloe

I've done over 100,000 miles in my 2001 WRX. Now engine light is always on. Garage unable to fix it for more than a couple of days. I think injector must be blocked as power on acceleration diminished. Someone suggests remap, but I don't want to put old friend at risk, and I understand none of the technicalities - just that it has been and still is a great car. Any advice, please?