What Does P0057 Mean?
The PCM has detected low voltage in the heater circuit of the Bank 2, Sensor 2 heated oxygen sensor. The downstream sensor's heater circuit is drawing less current than expected, indicating an open heater element, loss of power supply, or an open ground path. The driver will see a check engine light but driveability should be largely unaffected since this is a monitoring-position sensor.
Common Causes
40%
Open O2 sensor heater element (burned out or high-resistance winding)
25%
Open circuit in the heater wiring — broken wire, disconnected splice, or backed-out pin
20%
Blown O2 heater fuse
15%
PCM heater ground driver not activating
Diagnostic Steps
1
Check the O2 heater fuse — if blown, test the circuit for shorts before replacing.
2
Disconnect the Bank 2 Sensor 2 O2 sensor and measure heater element resistance — 3–15 ohms is normal, infinite resistance means the heater is open and the sensor needs replacement.
3
With KOEO and sensor disconnected, check for battery voltage on the heater power wire at the connector.
4
Verify the ground/control wire has continuity back to the PCM — an open ground is a frequent cause of low-voltage heater codes.
5
Inspect the wiring for damage. The Bank 2 downstream sensor wiring often runs along the underside of the vehicle and is vulnerable to road debris, corrosion from road salt, and exhaust heat.
Estimated Repair Cost
$100 - $300
Parts + labor, varies by vehicle and location
The PCM has detected low voltage in the heater circuit of the Bank 2, Sensor 2 heated oxygen sensor. The downstream sensor's heater circuit is drawing less current than expected, indicating an open heater element, loss of power supply, or an open ground path. The driver will see a check engine light...
The most common cause of P0057 (Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 2 Sensor 2) is: Open O2 sensor heater element (burned out or high-resistance winding)
Typical repair costs for P0057 range from $100 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. This downstream sensor has minimal impact on engine performance. The sensor will eventually reach operating temperature from exhaust heat, but the catalyst monitor readiness flag will not set. Repair before emissions testing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0057 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Emissions / Exhaust
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
