Need some advice my car was running fine and had power but had a strange buzzing type sound like bees buzzing. I put my passat 1.9tdi on hand held scanner. There was 1 fault, valve for intake manifold flap n239 open or short to ground, I know this is too do with anti shudder valve so different forums say. So I got some egr diesel spray took the pipes off and sprayed a few bursts and few revs with egr still on the car. Put everything back together turned car over and my emissions workshop light came on and engine management light drive out of my drive and they both went off. Have never come back on but I'm having a loss of power now. Put scanner back on car 1 fault map sensor brought new map and hey still have power loss . Any ideas or thoughts? I know it's not the turbo as the power was normal this started when I cleaned egr also still have buzzing sound but it's quieter then it was.
egr and now power loss
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