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P0153 - O2 Sensor Circuit Slow Response Bank 2 Sensor 1

Possible causes
- Faulty Front Heated Oxygen Sensor Bank 2
- Front Heated Oxygen Sensor Bank 2 harness is open or shorted
- Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks
- Exhaust gas leaks
What does this mean? What does this mean?
Tech notes
Replacing the Front Heated Oxygen Sensor Bank 2 usually takes care of the problem.
What does this mean? What does this mean?
When is the code detected?
The response of the voltage signal from the sensor takes more than the specified time.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible higher than usual fuel consumption
P0153 Description

The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

P0153 Information for specific makes
P0153 AUDI HO2S21 Sensor Circuit Slow Response
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P0153 FORD O2 Sensor Circuit Slow Response Bank 2 Sensor 1
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P0153 PONTIAC HO2S Slow Response Bank 2 Sensor 1
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P0153 SUBARU HO2S21 Circuit Slow Response
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