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ecu has no codes stored regarding engine light on?

had an ecu fitted the engine light still comes on - asked why mechanic told me ecu has no codes stored
irene miles, September 2009
Make/year/model of car?
Is it a brand new ECU or secondhand?
They usually have to be 'coded' to the car and security system using dealer-level diagnostics equipment, was this done?
How do you know the original ECU was at fault, did you send it for testing?

spud, September 2009