hey ht ui have a 1995 dc2 gsr ive had the car for about 4months now it didnt have the cel on when i bought it(check engine light) when i took off my cluster i seen that the bulb to light up the cel icon wasnt there so i put in a brand new one after i put everything back together and turnd on my car i noticed the cel light was on so i check the code and it was or is still throwing code 41 bad o2 sensor ok so here is the problem i have replaced the o2 sensor 3 times aready with a brand new o2 sensor but my cel light still stays on could it b that my ecu is messed up i have the og obd1 p72 any help on how to fix this ??