P0057

HO2S Heater Control Circuit Low Bank 2 Sensor 2

Q: Is it safe to drive with P0057?

Yes — it won't leave you stranded. The main downsides are a failed emissions test and slightly higher emissions until fixed.

Q: Can I just clear P0057?

It clears, but returns once the heater circuit fails again, and readiness monitors stay incomplete until the fault is repaired.

Oxygen sensor heater Generic OBD-II Medium

What it means

P0057 means the heater circuit for the downstream oxygen sensor on Bank 2, Sensor 2 is reading low — usually a short to ground or open in the heater wiring or a failed heater element. The heater brings the sensor up to operating temperature quickly so it can read exhaust oxygen. The engine still runs normally; the real effect is on emissions monitoring, so the code mainly matters for passing an emissions test.

Medium

Can I keep driving? Yes — the car drives normally; this downstream O2 sensor heater mainly affects emissions readiness and monitoring, not how the engine runs.

Real-world scan data

Seen in

242

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0057 scans

P0037in 55.8% of scans

P0031in 33.1% of scans

P0051in 32.6% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Emissions readiness monitors won't complete (can fail an emissions test)
Slightly increased emissions until the sensor reaches temperature

Common causes

Most likely first

Failed oxygen sensor heater element (Bank 2, Sensor 2 — downstream)Likely
Open or short-to-ground (low) in the heater control wiring or connectorCommon
Loose or corroded connection, or a blown heater fuseCommon
Failed ECM heater driver (rare)Less often

How to diagnose & fix

Work through it in order

Confirm the code and check the sensor's heater fuse and connector.
Measure the heater element's resistance across the sensor's heater pins.
Inspect the control wiring for a short to ground or an open circuit.
Replace the downstream O2 sensor if the heater element is open or out of spec.
Repair wiring, clear the code, and run a drive cycle to confirm monitors complete.

FAQ

Quick answers

Is it safe to drive with P0057?+

Yes — it won't leave you stranded. The main downsides are a failed emissions test and slightly higher emissions until fixed.

Can I just clear P0057?+

It clears, but returns once the heater circuit fails again, and readiness monitors stay incomplete until the fault is repaired.

Read & clear P0057 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX