Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Either the oil is just a little low so that when then engine does start the sensor isn't picking up the oil level or the sensor itself is going bad. You could try adding just a little more oil to the engine and see if the problem goes away, if not then your sensor is going bad and in order to replace it the engine has to come apart since it has to be removed and installed inside the engine block.