P1133 HONDA Possible Causes
- Faulty Heated Oxygen Sensor (HO2S), Bank 1 Sensor 1
- Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 harness is open or shorted
- Heated Oxygen Sensor (HO2S), Bank 1, Sensor 1 circuit, poor electrical connection
- Air leak in the exhaust near the O2 sensor
How to Fix Code P1133 HONDA?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
When is the Code Detected?
If the Powertrain Control Module (PCM) determines that the front HO2S has not switched enough times, the PCM will set the P1133 code.
Possible Symptoms
- Check Engine Light on (or Service Engine Soon warning light)
P1133 HONDA Meaning
The Engine Control Module (ECM) monitors the activity of the Heated Oxygen Sensor (HO2S) for 90 seconds after the start of closed loop operation. The ECM determines if the front HO2S is working properly by counting the number of HO2S-1 Lean/Rich (L/R) and Rich/Lean (R/L) switches.