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90 300se
about the only thing that the cel was for back in 90 was to warn of problem with o2 sensor.if the ecu did not see a changing voltage over a period of 10secs it would bring on the light.this could be one of 4 things.[1] system has vacuum leak and so very low voltage[2]system is running too rich[.900 volts][3]o2 sensor disconnected.[4] o2 sensor defective.hope this helps.
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