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There is a thermal fuse in the catalytic converter of a MK1 imported Eunos Roadster. If it overheats the HEAT light will illuminate. Usually this is caused by a miss-fire.
You can often cure the cause of the HEAT light, but the light will remain illuminated as the sensor has tripped.
There are 2 solutions available:
Buy a new HEAT sensor, which can then be installed in the catalytic converted and plugged into the wiring loom.
Unplug the sensor.
Unplugging the sensor will turn out the warning light with out any adverse problems being caused. It is recommended however to replace the sensor as it will give you an early warning of plug/lead/coil failures or any other problem that may cause the catalytic converter to overheat.
