Q: check engine light on 1995 Mazda B3000

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Is there a simple way to shut off the check enginelight? I have had it checked and it is always on because the gas cap is not tightened properly, but i don't want to pay $75 to find that out again. Any ideas?
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Your Mazda has OBD2 level diagnostics which should have the fault checked with a scan tool connected to the 16 pin diagnostic socket under the dash. Once the fault is checked and repaired the light can be turned off using the scan tool.
If it is a loose gas cap the on board computer checks the system as you drive and once certain drive criteria has been met it will turn off the light itself once it sees the fault is no longer present (it may take a while as it usually has to see the fault no longer present for two drive cycles).
Disconnecting the battery may erase the code as well. Leave the battery disconnected for several minutes and with the battery disconnected touch the two battery cables together to discharge any capacitors in the system.
just unplug the red/power wire on the battery for 2 or 3 min in this will turn off the check engine light
also you can purchase ur own diagnostic computer from walmart for 55 dollars