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...happens & what are the results.? It use to happen that whenever i drive on a rough road or take a sharp turn the D4 light starts blinking. After several checks the company diagnosed that the engine harness is to be replaced.My question is that, will this solve my problem or what is the other way out.

 
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It is hard to determine if the replacement of the harness will solve the problem. If you believe that driving at rough road is the cause of the problem, the broken harness should be located undeneath the car.