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someone help me please, i bought this car 3 months ago and i had the problem since. it started with the DPFE sensor hoses blowing off, i replace the DPFE sensor but the problem continued, then the EGR valve blew up and i had to replace it too, then i took it to auto zone and they told me that...

i Had a check engine light and took it to the mechanic ,he said it was an oxygen sensor (sensor 1 bank 1) we replace it. the next day the light went on again.what could the problem be,