![]() ![]() The first requirement of the drive cycle is that your engine must be at the operating temperature (179F in my case). After 50 miles, all monitors were ready.īefore that, I drove over 400 miles following the manufacturer drive cycle many times without hope. I replaced the thermostat and went to pickup a spare tire. ![]() I spent a month observing and investigating why my CAT monitor was not ready and root caused to the defective thermostat. If your engine is not, then the drive cycle will not work. The manufacturer drive cycle is designed for a ‘properly’ operated engine. In that case, it may be time to have your vehicle properly diagnosed and repaired by a shop that has the training, equipment, and experience necessary to diagnose and repair OBD monitor issues. If several reasonable attempts at running the drive cycle fail to complete the catalyst monitor, a problem may exist that is preventing your vehicle from running the monitor to completion.
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