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Check the wiring harness between the body and the engine. I had two codes keep popping up after I replaced my blown ECU. It turns out that the blown ECU and the codes were caused because of two frayed wires located within the corregated harness housing between the firewall and the engine that were shorting together. Years of the wires rubbing on the inside of the corrigated harness as the engine shakes caused the wires to fray. I replaced the frayed wiring by soldering in new wires in and the car was fixed, no codes. Even though my car is not the same as your's (I have a 2001 Jetta TDI) the concept maybe the same, it's worth a try.
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