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P0133 Means the Bank1 Sensor 1 oxygen sensor is not communicating correctly with the computer, weather the sensor is failing, or there is an issue with the wire/connection from the main harness to the the sensor lead itself. usually replacing the oxygen sensor (this one is located just off the engine in the exhaust manifold) will resolve the issue.

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11y ago
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Q: What does the P0133 error code mean in a Saturn SL2?
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