Staff Answer
Jun 25, 2026 - 02:55 PM
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The P0153 code indicates O2 Sensor Circuit Slow Response (Bank 2, Sensor 1). This means the engine computer is detecting that the oxygen sensor is taking too long to switch between "rich" and "lean" readings, indicating the sensor is aging or becoming sluggish.
Common Causes:
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Aged/Contaminated O2 Sensor: Carbon buildup or normal wear has slowed the sensor's reaction time.
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Exhaust Leaks: A leak near the sensor can introduce "false air," confusing the readings.
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Wiring Resistance: Corrosion or loose connections in the sensor circuit increasing signal resistance.
Troubleshooting Steps:
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Inspect Exhaust: Check the exhaust manifold and pipe near the sensor for cracks or leaks.
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Clean Connections: Disconnect the O2 sensor harness and clean the pins with electronic contact cleaner.
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Replace Sensor: If wiring and exhaust are solid, the sensor is likely just worn out and needs replacement to restore engine efficiency.
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