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P1133 Buick

P1133 Buick - HO2S Insufficient Switching Bank 1 Sensor 1

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Possible causes
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
- Vacuum leak
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 harness is open or shorted
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 circuit poor electrical connection
Help with Possible causes What does this mean?
When is the code detected?
If the Powertrain Control Module (PCM) determines that the front HO2S did not switch enough times, the PCM will set the P1133 code.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1133 Buick Description

The Powertrain Control Module (PCM) monitors the Heated Oxygen Sensor (HO2S) activity for 90 seconds after closed loop operation has begun. The PCM determines if the front HO2S is functioning properly by counting the number of HO2S-1 Lean/Rich (L/R) and Rich/Lean (R/L) switches.

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BUICK Technical Service Bulletins for P1133 code
1999 BUICK LESABRE Engine And Engine Cooling:exhaust System:emission Control Details
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