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OBDII codes are cleared with a scan Tool. I recently had 3 vehicles with the CEL/SES on. Although a parts store read the codes for me and I affected the repairs, I still needed a OBD2 Scan Tool to clear the codes. I purchased AutoEngnuity's ($250 with tax)OBD2 PC-based Scan Tool software online which comes with an OBD2 interface module (USB, or RS232) to connect to the vehicle. The device has already paid for itself, and it can do more than just read, and clear codes.

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Q: How do you clear codes P0300 P420 and P0304 from a 1997 Mazda Millenia?
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