There is an instance in which there is NO minimum height, and it is important to understand. If your employees are working over dangerous equipment, machinery, or any hazard into which they could fall, they must have fall protection at all times or machine guarding needs to be put into place. No exception.
CATALYTIC CONVERTER FAILURES: If your catalytic converter needs replacing, then it is highly probable that at least one of the six causes below has contributed to its failure. An Oxygen Sensor is Not Functioning Properly. An oxygen sensor failuring can lead to incorrect readings of exhaust gasses.
This can overheat the catalytic converter far above normal conditions and cause it to melt down. Probable causes are a faulty oxygen sensor, an out-of-spec fuel mixture, incorrect timing, malfunctioning spark plugs, a sticking float, a faulty fuel injector, or a malfunctioning check valve. An Engine Tune-Up is Required.