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RA28 + MX73
RA28, MX73
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It's called the OK Monitor in Japan or the ESP (Electro Sensor Panel) in America.
It detects things like worn brake pads, brake circuit failure, low washer fluid, etc.
For the US spec Celica it was on the 76 and 77 model year RA29 GT liftback and RA24 GT coupe but not the RA24 ST coupe.
It was also available on the similar year Corona RT114.
 
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