The frequency will increase with wheel speed under normal fault free operation. It is frequency that the ECU uses to calculate the wheel speed. When testing in the workshop. Unless you have the ability to drive the wheels at the same speed then the frequency will always be different.
The amplitude being low on the bad sensor was because the sensor was faulty but could also be caused by the air gap being wrong. The amplitude was low enough that the ECU was not seeing any signal.
I wouldn’t say that’s a typical failure. Missing switch points due to damage or open circuit (total failure) would probably be more common.
Just to give it some context, the bad sensor was a new GSF cheapie special. The garage faulted the old sensor based on a code read alone. Fitted the GSF one, then fitted a module which they asked me to code then asked me to look further when the module didn’t fix the fault. A new genuine sensor fixed it.
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