code 41 is the electronic load detector, and a code 20 is an o2 sensor heater. i have like 3 crank angle sensors for obd-2 engines. the ELD is located under the fuse box in the engine bay, it controls headlights, fuel pressure/injectors, charging etc. you have to check for voltage on this guy and i can get you a link for a free manual. code 41 you need to check the voltage of the o2 sensor. if the eld isn't right i'm sure a lot of things can happen.