maybe this sounds idiodic... I have a OBDII. Sometimes you can get stored codes by jumping the 2 wire together. But would a OBDII scanner do the same? how about even if the CEL is not on but there is a code stored?

 

the cel would be on if the code was stored...the way to get rid of stored codes is to either unplug the ecu for more than 15 seconds or remove the ecu fuse under the hood for more than 15 seconds...

 

but would a OBDII scanner do everything that jumping the wires would do?

 

it actually does more...apparently it will check all the sensors and calculate different parameters for you...it can also clear codes and check the "stored" codes as well...it will also limp or unlimp your car as well...it's just a neat tool to have, but unfortunately it's expensive...

 

thanks for your help. youve been a great help

 

yeah, but one more thing...if you do decide to get one of the scanners, don't cheap out...you get what you pay for...i believe some of them even connect to a laptop, which would be my choice...anyways, goodluck

 

Nick, have you got one? What kind? I'm kinda thinking about getting one, but I'm not sure what kind.

 

no, i don't have one...i am obd1

 

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Not always. Temporary codes wont turn on the light. Also with some problems, if the light was on and the ECU doesn't see the problem for a number of drive cycles, the light will go out. But the code will remain in memory.