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P0133 Ford

P0133 Ford - O2 Sensor Circuit Slow Response Bank 1 Sensor 1

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Possible causes
- Faulty Front Heated Oxygen Sensor Bank 1
- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks
Help with Possible causes What does this mean?
Tech notes
Replacing the Front Heated Oxygen Sensor Bank 1 usually takes care of the problem
Help with Tech Notes 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)
- High Fuel Consumption
- Excessive Smoke from Exhaust
P0133 Ford 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.

P0133 Ford Information for specific Ford models
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FORD Technical Service Bulletins for P0133 code
2001 FORD FOCUS Electrical System Details
2001 FORD TAURUS Electrical System Details
2002 FORD FOCUS Electrical System Details
2002 FORD TAURUS Electrical System Details
2003 FORD FOCUS Electrical System Details
More Bulletins Help with Technical Service Bulletins What does this mean?
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