Replacing new battery and resetting ecu
Try makeing sure everything is off, disconect batry for 5 min. Reconect, Turn key to start vehicle no accelerater or anything. Let Idle for several minutes then drive 10km. If this doesn't work you may have to perform a specific re learn precidure
HOW TO REFIT A 1989 LOTUS ESPRIT REAR QUARTER
The glass is siliconed in which takes a heating knide to remove. A trained automotive glass technician knows how to use one and also to instal. A photo below shows the quarter glass opening without the glass installed
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