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LH jetronic 2.4

Is it possible to read fault codes direct from the ECU?I have wiring from a 760-88 and engine from a 940-96.Socket 12 at the ECU should go to the diagnostic connector but I dont have a connector.There is a free wire at socket 12, can I read fault codes from that one?I thought the lambda was broken, I changed it but theres no difference.







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