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Focus tdci whistle?


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Hi there, just wondered if anyone could shed some light on this please?

i have a Ford Focus mk2 1.6tdci

i had a split turbo pipe changed and then it split again where it goes into the turbo.

i am getting a whistle noise when the turbo slows down, I always thought it was the pipe. Once I sorted the pipe I still had the noise but then got a light on my dash with the code p0234 overboost.

changed the actuator, cleaned the turbo with oven cleaner. Full oil change and new oil filter. Started the car and same problem!

however the next day the ecu light went off. Noise still remains. Any suggestions?


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