P1133 BUICK - HO2S Insufficient Switching 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
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.
Recent ECM, gas cap replaced and one cycle of "Cataclean" to 4gallons of gas refilled with high test...
Thanks Reynaldo! Yes it did. Final test at 50mph, floored it, with STEADY acceleration to 80mph. No ...
Any information is appreciated. Thanks