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The P1170 diagnostic code for a 2000 Toyota Avalon indicates a problem with the air-fuel ratio (AFR) sensor, specifically related to the sensor's signal or performance. This code typically points to an issue with the oxygen sensor or the engine control module (ECM) interpreting the sensor's data incorrectly. Common causes include a faulty AFR sensor, wiring issues, or vacuum leaks. It's advisable to conduct a thorough inspection to determine the exact cause before replacing any components.

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1mo ago

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