My 2003 ram 1500 47v8 when you turn ignition to on position the engine computer is supposed to run some checks and turn on all the warning lights on such as check engine battery and etc and then they are supposed to turn off once the engine is running. My miata was running fine parked it for the night the next day it will not start turn the key on all the check lights come on except the check engine lighttheirs no spark no fuel pump it has an old battery but it still turns the motor over good just checked batt 1306volts i think my computer controll is dead ecu eci im not sure what . I have a 2000 toyota camry that has a unique problem the check engine light never comes on even when first starting the car i have access to a scanner and know that the car periodically throws a catalyst code but the light never comes on. Have a check engine light on with no code there are a number of reasons that this may be happening from mechanical to computer to outdated equipment there are still plenty of ways to see why the light came on what the actual issue is and what needs to be done to fix it lets check engine light is on but no codes what should you do. Check engine light engine check engine light with no stored codes 1993 mustang gt will not display check engine light until it is turned over and will not throw codes any links that detail computer codes inputs outputs resulting in check engine lights 1997 cobra check engine light making me crazy
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