A cat 1 fault is a faulty sensor a fault code as appeared saying this or that sensor is out of range
Check the sensors function and its wiring and proceed from there wiring checks out new sensor.
But factor in possible ECU faults and intermittent nature then a detective led hunt takes place carefully checking and taking notes
No1 all sensors are innocent until proven otherwise evidence is needed before condemning any part Remember the throw parts at it idea doesn't work
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