That's where a narrowband is no good. A narrow band o2 sensor is not fast or accurate enough to tell you your rich or lean in boost. It doesn't tell you what your afr is.
Get a wideband.
Those are hot spots.
Most likely from cheap pads being overheated.
Use oem pads or ceramics. They perform better.
I'd get new rotors as well. It's generally best to replace rotors after they have hot spots.
The relay has 2 parts.
A magnetic coil that gets energized from a 12v switch source like the ignition. Other side gets grounded.
And the switch that gets closed when the switched power energizes the coil. which one side would be from the battery and the other side to a safc or wideband.
Whats funny is f1 drivers like lewis Hamilton drive faster than most people for a living and they still crash cars...A lot more expensive and better handling ones...
If you leave them on all the time they will kill your battery.
Relay just gets a signal from smaller circuit and uses power for the component from a better source like the battery.
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