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Sounds like some good suggestions. I have been concerned that the voltage fluctuations could be throwing off the sensors and affecting the engine efficiency, but I have never really noticed any changes in gas mileage or drive feel in the car since it was almost new.

I got the ripple reading from a Topdon BT100 electronic battery / charging system tester.

1.8 l gas.

I have been getting high ripple readings of ~300-400 when I test the charging system for a long time, but the car has always charged and run fine. On some nights, I notice the headlights and dome lights will pulse very noticeably while driving, but not every night. I watched my scanner three...