HO2S Signal Circuit Shorted to Heater Circuit Bank 1 Sensor 1
Table of contents
P2231 SUZUKI Possible Causes
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
- Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted
- Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How do I fix code P2231 SUZUKI?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P2231 SUZUKI code
The cost of diagnosing the P2231 SUZUKI code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P2231 SUZUKI Description
The Engine Control Module (ECM) supplies a voltage near 450 mV between the Heated Oxygen Sensor (HO2S) signal circuit and the low reference circuit. The HO2S varies the voltage over a range from about 1,000 mV when the exhaust is rich, down through about 10 mV when the exhaust is lean. The ECM monitors and stores the HO2S voltage information. The ECM evaluates the HO2S voltage samples in order to determine the amount of time that the HO2S voltage was out of range. Or, to detect if the HO2S signal voltage switches at the same rate at which the ECM is commanding the heater ON and OFF. The Diagnostic Trouble Code (DTC) will set if the ECM detects that the HO2S signal voltage increases more than 2 volts in 4 out of 6 HO2S heater switch OFF samples.
