Thread: 3 mpg
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Old 03-21-2013, 03:08 PM
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There you go. P0133 indicates a slow response from the 1/1 O2 sensor which is a primary sensor used for calculating the fuel curve. The P0171 indicates a lean condition which means the PCM will be trying to enrich the fuel mixture. Replace the upstream sensor, clear the codes and run a couple of tanks of fuel through it and track your MPG. You should see an improvement.
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