What makes the check light come on for running rich bank 1

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! Running rich on Bank 1 and that fuel smell likely mean too much gas and not enough air in the mix. The low-RPM misfire points to potential culprits like a leaky fuel injector, a bad oxygen sensor, or even a clogged air filter. At high RPMs, the engine gulps enough air to balance things out, but at low RPMs, the excess fuel overwhelms it. Start by checking for a dirty MAF sensor (Mass Air Flow)—a quick spray with cleaner might fix it. Also, inspect for vacuum leaks or a lazy O2 sensor not reading properly. If the injector on Bank 1 is stuck open, it's spraying fuel like it’s happy hour, so you’ll need to clean or replace it. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.