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How do you clear the history codes? Its on a 98 concours. Thanks in advance-Joey. And what does history mean anyway?
 

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There are 2 basic types of DTCs (codes). "Current" and "History". Current codes are exactly what you would think, they are occuring now during the "current" ignition cycle. "History" codes are ones that happened in a past ignition cycle and are NOT currently occuring. All CAN be cleared by use of the OBD system and/or removing power from the module, but to be honest, history codes clear themselves after several ignition cycles without reoccurance ( I thing 15 cycles but don't quote me on it).
 

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i got a 1997 deville and the current codes that are coming up are PCM PO502,
IPC B1910, AMC B1341, TCS C1241 what do these codes mean can someone help me out here.
 
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