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Help me...odd issue

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I have a 2001 S and the cel is on. Here's the weird part. The car was making a high pitched sucking sound near the fuel filler. I had an error code for the evap system so I figured it was either the purge valve or the bleeder at the filler neck. I changed out the purge valve and the the cel and noise went away. A week later noise and cel is back. However, this time when I went to scan it i got 4 codes that were all O2 sensor related. Any ideas? The maf has been changed and the car runs great, but the cel and sucking noise is very annoying.

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Almost all codes are O2 related because the O2 sensors report the fault.

O2 sensors can report a lean condition or rich condition or many other problems that have nothing to do with bad O2 sensors.

If you don't know the codes go to an Autozone (or other parts store) and get your codes read for free. Without the codes everyone is just shooting in the dark.

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