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The simple answer is to ask you what codes are read out of the OBD2 port by a scanner.
Are they connected either to emissions or engine control or something else?
Did your car have 2 or 4 Oxygen sensors (Lambda sensors on the other side of the pond)? Where was your car originally sold? What did you do with the sensors? Show pictures of where installed.
Classic outcome of messing with the emissions/exhaust.
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