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FYI, I had a mechanice replace the O2 sensor and the check engine light came back on again. I then changed the air filter and took out the Mass Air Flow sensor and cleaned it with electrical parts cleaner and put it back in. I also added a fuel injector cleaner to a full tank of gas. I reset the light by removing the negative cable to the battery for 30 seconds. This worked well enough for the car to pass a NYS inspection.

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Q: What causes the PO171 engine code in a Chevy Prizm?
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