Possibly faulty ECU. Options?

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After fixing the headlights problem caused by the anti-theft ECU (see separate thread), I got a similar issue again (after pulling the key off, the headlights turned on again and wouldn't turn off, even with the car locked).

I started pulling fuses from the main box in the engine bay and the 20A one for the ECU was the culprit.

How feasible (i.e. economical) is it to replace it? I can see them on eBay for anything from £20 up. Would it need coding or (assuming I find the exact same part) is it a straight swap?



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