[Philip]

Error 42 is a communications fault between the Extra Battery pack and the Main Board. I don't know what the other two errors are, but they also likely relate to the same area (or they are examples of the % battery charge, interchanging with the display of the error code).

The usual cause of Error 42 is that your Extra Battery has come loose against the Stem, so the connection between the pack and the board is intermittently disconnecting while riding, (or permanently disconnecting). This can cause arcing between the pins and sockets, carbonisation of the metal, and damage to the connector/plug itself...and ultimately permanent damage to either the pack or the board. Light carbonisation can often be cleaned up successfully.

Even if the two 3mm hex fasteners that attach the Extra Battery to the Battery Bracket are tight, you also need to tighten the three 2.5mm hex fasteners that hold the Bracket to the Stem. I suggest applying fresh thread-locker compound (eg Loctite) to these 5 threads.

The main cause of loosening of these bolts is riding the KickScooter too enthusiastically!

Are you riding over a lot of rough surfaces, such as chip-seal road or concrete paths with loses of joins? Check the User Manual - the design spec for the width and height of gaps/thresholds is probably smaller than you are encountering. Slow down so that you strike these gaps/thresholds with less force, and check that your rider+cargo weight does not exceed the design spec. Otherwise your entire KickScooter is going to wear out relatively quickly (in the same way as a person who drives their car hard and fast is going to burn through tyres, etc).

Fast wear of your front tyre within 100-200 km suggests a lot of skidding has been occurring.

One cause of rapid wear is through slight lifting of the front tyre with every "kick" - this most often occurs when the rider is kicking to assist the KickScooter while riding up steep hills. If every kick causes a little lift and thus a little slip of the wheel, then this will skid away your tread rather rapidly. Like, within a couple of hundred km's (or even less). These brief little skids happen even more readily in wet conditions, of course. Modify your riding style so as to prevent these split-second skids every time you kick. Also, lighten up on the throttle response so you're not causing wheel slip during acceleration (again, enhanced if you tend to pull back on the handlebars and skid the front wheel as you take off).

Some owners are able to get a couple of thousand kilometres - or further - of good, safe use from a front tyre on an ES-series before they need to replace it due to wear. Others....not so far. The difference mostly comes down to riding style, and some comes down to the road surface and slope, and rider weight.