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Home › Cadillac › 1988 › Seville STS › Repair and Diagnosis › Engine Performance › Testing & Diagnosis › DFI ECM Tests W/Codes › ECM Code EO38 - Open Mat Sensor Circuit › DFI ECM Tests W/Codes › Test Conditions:

Test Conditions:

Codes EO14 and EO15 are clear. Coolant temperature sensor greater than or equal to -5°C.

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