The Quick Answer above is the generic definition. What follows is the model-specific detail for the Infiniti models that log P0057.
DTC/P0057·Infiniti
P0057 on Infiniti: Causes, Symptoms and Fix Cost
Quick Answer
Low SeveritySafe to drive (short-term)Infiniti
P0057 on a Infiniti means the engine computer measured too little current or too low a voltage in the heater circuit of the downstream oxygen sensor on bank 2, after that bank's catalytic converter. Bank 2 is the half of the engine without cylinder 1, so this code only appears on V6, V8 and other engines with two cylinder banks and separate exhaust sensors per bank. The car usually drives as before. A new downstream sensor typically costs about 90 to 310 EUR fitted.
Typical repair cost, all makes€1 - €310
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Infiniti G37 Coupe (3.7 V6)
2008-2013The VQ37VHR V6 has a heated oxygen sensor after each bank's catalytic converter, and Infiniti's manual diagnoses P0057 (bank 2) alongside P0037 (bank 1): battery voltage at the sensor connector, a 15 A fuse (No. 46) through the engine-room power distribution module (IPDM E/R), continuity to the engine computer, then a heater resistance of 3.4-4.4 ohms at 25 C. The manual's confirmation test holds the warm engine at 3,500-4,000 rpm for a minute without load and then idles it for a minute.
What causes P0057 on a Infiniti?
Beyond the generic causes listed on the main P0057 page, these are the patterns noted for Infiniti models:
Infiniti G37 Coupe (3.7 V6)Burned-out heater in the bank 2 downstream sensor
Infiniti G37 Coupe (3.7 V6)Blown 15 A heater fuse or an open in the supply harness
How to diagnose P0057 on a Infiniti with OBD2
Follow these steps to pinpoint the root cause of P0057:
- Confirm which sensor the code means before buying parts: bank 2 is the cylinder bank without cylinder 1 and Sensor 2 is the sensor after that bank's catalytic converter. Check the cylinder numbering for your engine in the service information, because the side of the car bank 2 sits on differs between engines
- Read all stored codes and freeze frame. P0057 together with P0037, P0155 or other heater codes points to a shared fuse, relay or supply wire rather than several failed sensors
- Check the oxygen sensor heater fuse named in the owner's manual or on the fuse box lid. Replace it if blown, and if it blows again look for a short in the heater or its wiring
- Raise the car safely, unplug the Bank 2 Sensor 2 connector and measure the resistance across the two heater pins. Many downstream sensors read between about 3 and 15 ohms at room temperature; check your car's specification. An open circuit means the heater has burned out
- With the key on, check for battery voltage on the heater supply pin on the harness side of the connector. No voltage points to the fuse, relay or supply wire
- Inspect the connector and the wiring along the exhaust and underbody for corrosion, pushed-back pins, melted insulation or chafing, and repair as needed
- After the repair, clear the code and drive a mix of town and steady faster driving. With a generic OBD2 reader, check that the bank 2 downstream sensor voltage switches normally once warm and that the oxygen sensor heater and catalyst readiness monitors complete
How much does P0057 cost to fix on a Infiniti? (EUR)
Estimated repair costs for P0057 in EUR, compiled across makes. Expect Infiniti parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0057
These codes are often seen alongside P0057 or point to related issues, on any make:
Looking for the full P0057 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0057 guideSkanyx · Infiniti
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