P0157 Code - O2 Sensor Circuit Low Voltage Bank 2 Sensor 2
Quick Answer
The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0157 indicates O2 Sensor Circuit Low Voltage Bank 2 Sensor 2.
- Common causes
- Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0157 Description
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the heated oxygen sensor is shorted to ground if the HO2S voltage is less than 50 mV.
What are the Possible Causes of the DTC P0157?
- Faulty Rear Heated Oxygen Sensor Bank 2
- Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
- Low or high fuel system pressure
- Fuel contamination
- Faulty fuel injectors
- Exhaust gas leaks
- Engine vacuum leaks
How to Fix the DTC P0157?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0157 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P0157 Acura — O2 Sensor Circuit Low Voltage Bank 2 Sensor 2
- P0157 Audi — HO2S22 Sensor Circuit Low Voltage
- P0157 BMW — O2 Sensor Circuit Low Voltage Bank 2 Sensor 2
- P0157 Buick — HO2S Circuit Low Voltage Bank 2 Sensor 2
- P0157 Cadillac — HO2S Circuit Low Voltage Bank 2 Sensor 2
- P0157 Chevrolet — HO2S Circuit Low Voltage Bank 2 Sensor 2
- P0157 Chrysler — O2 Sensor 2/2 Circuit Low
- P0157 Dodge — O2 Sensor 2/2 Circuit Low
- P0157 Ford — O2 Sensor Circuit Low Voltage Bank 2 Sensor 2
- P0157 GMC — HO2S Circuit Low Voltage Bank 2 Sensor 2
- P0157 Honda — O2 Sensor Circuit Low Voltage Bank 2 Sensor 2
- P0157 Hyundai — HO2S Circuit Low Voltage Bank 2 Sensor 2
- P0157 Infiniti — HO2S22 Circuit Low Voltage
- P0157 Jaguar — O2 Sensor Circuit Low Voltage Bank 2 Sensor 2
- P0157 Jeep — O2 Sensor 2/2 Circuit Low
- P0157 KIA — HO2S21 Circuit Low Voltage
- P0157 Lexus — HO2S22 Circuit Low Voltage
- P0157 Mazda — HO2S LR Circuit Low Input
- P0157 Mercedes-Benz — O2 Sensor Circuit Low Voltage Bank 2 Sensor 2
- P0157 MINI — O2 Sensor Circuit Low Voltage Bank 2 Sensor 2
- P0157 Mitsubishi — Cylinder 2-3 Heated Oxygen Rear Sensor Circuit Low Voltage
- P0157 Nissan — HO2S22 Circuit Low Voltage
- P0157 Pontiac — HO2S Circuit Low Voltage Bank 2 Sensor 2
- P0157 Saturn — HO2S Circuit Low Voltage Bank 2 Sensor 2
- P0157 Scion — HO2S22 Circuit Low Voltage
- P0157 Subaru — HO2S22 Circuit Low Voltage
- P0157 Suzuki — HO2S Circuit Low Voltage Bank 2 Sensor 2
- P0157 Toyota — HO2S22 Circuit Low Voltage
- P0157 Volkswagen — HO2S22 Sensor Circuit Low Voltage
Frequently Asked Questions about P0157 Code
No Frequently Asked Questions about P0157 Code found.
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