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I have a 2008 saturn astra replaced o2 sensors now makes squealing noise


This all started on vacation started cutting out not wanting to go really kinda putting around was told misfiring need o2 sencor coil pack injector cleaned so started with smallest put injector cleaner in as recommended after few miles heat sheld shredded so got it home changed coil pack and both o2 sensor now it makes squeel noise

 

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