P0057: HO2S Heater Control Circuit Low Bank 2 Sensor 2
A generic powertrain (engine and transmission) trouble code, same meaning on every brand.
Yes.
Symptoms
- Check engine light
- No felt change
- Inspection failure on readiness
Likely causes, most common first
- Heater shorted to ground
- Element failed
- Harness worn through under the car
- Moisture in the connector
Read P0057 yourself before paying for diagnosis
A basic Bluetooth OBD-II scanner ($20-40) plugs into the port under the dashboard and shows this code with live sensor data on your phone - useful both for confirming the fix and for talking to a shop from an informed position.
What is going on and how it gets diagnosed
P0057 - bank 2 downstream heater, low reading. The same underbody logic as P0037 applies: wiring before sensor, because the harness lives in the line of fire of stones, salt and heat.
Worth a moment of honesty about repair choices here: aftermarket universal sensors with splice-in wiring are noticeably cheaper and noticeably more likely to bring this exact code back within a year - splices under a car corrode. A direct-fit sensor with its own molded connector costs more up front and tends to be the last time you think about it.
Repair options and cost
Typical US independent-shop ranges, parts and labor. Dealers run higher; regional labor rates vary.
Owner reports mentioning P0057
“All the lights on the dash came on at once . The non skid, check engine , cruise lights wouldn't go off . I took it to the subaru dealership and they made out like it was nothing . I took it 3 different times they ended up charging me $500 dollars and never fixed anything. In a months time they came back on. I've had them turned off several times for them to come back on in 2 days time. I just recently put it back in the garage and was told the scanner found various codes. They cleared all codes , but code p0057 kept coming back for communication between antilock brakes and ecm. Possible cause- wiring, ABS module,or ecm.”2010 Subaru Forester · Aug 2015 · 80,000 mi
Cars that report P0057 most often
Based on mentions of this code in NHTSA owner complaints.
Frequently asked questions
Can I drive with P0057?
Yes.
How much does it cost to fix P0057?
Typical US repair costs range from $80 for the simplest fix (downstream oxygen sensor) to $400 in the worst case. The right number depends on which cause your car has - see the causes list.
Related codes
The codes closest to P0057. They often appear together, and telling them apart is usually what narrows the diagnosis.
Definition per SAE J2012 standard nomenclature. Symptoms, causes and costs are editorial guidance - always confirm with a diagnosis of your specific vehicle.