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EGR valve/ Oxygen sensor?

Hi, I have replaced the EGR valve and oxygen sensor on my zafira because the car was losing power at slow speeds particularly in car parks. Following these parts being replaced the problem is no better but the diagnostic machine says nothing wrong?? Any ideas please :-)
Wendy, April 2010
Maybe crankshaft sensor is worth a look

wickham, April 2010
link Click here to see other fixes for Opel Zafira.