P0057 OBD-II Trouble Code: HO2S Heater Control Circuit Low (Bank 2 Sensor 2)

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0057 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0057 code

P0057 is a diagnostic trouble code (DTC) for "HO2S Heater Control Circuit Low (Bank 2 Sensor 2)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0057 DIAGNOSTIC Get a fair and transparent estimate upfront

P0057 trouble code definition

P0057 is a code that sets when the powertrain control module senses that the voltage is low on the bank 2 sensor 2 oxygen sensor.

What the P0057 code means

When a P0057 trouble code sets it means that the powertrain control module has detected a fault, specifically low voltage, on the heater control circuit for the bank two sensor two oxygen sensor.

What causes the P0057 code?

  • The most common cause of the P0057 trouble code is a faulty bank 2 sensor 2 oxygen sensor.

  • Some other possible causes are faulty powertrain control modules or damage to the wiring in the heater control circuit.

What are the symptoms of the P0057 code?

There are no symptoms that you can feel from a P0057 trouble code. Since the fault is in the heater circuit this means that this sensor won’t be warmed up to operating temperature in a timely manner which will increase emissions during a cold start situation.

How does a mechanic diagnose the P0057 code?

Diagnostics vary based on manufacturer but the first step for myself is to inspect the wiring going to the bank 2 sensor 2 oxygen sensor. It is a common problem to find damage to the wiring or connectors from road debris or accidents.

Once it is confirmed that there is no damage to the wiring, it is time to check the integrity of the heater in the bank 2 sensor 2 oxygen sensor itself. This is done by disconnecting the oxygen sensor and using an ohmmeter to measure the resistance of the heater. The specification can vary depending on the manufacturer but it is generally around four to five ohms. If you see OL (out of limit) or INF (infinite) resistance that means the heater is burned out and the sensor must be replaced. Most times you will find that the heater circuit in the sensor itself is burned out.

If your sensor is ok you need to check the wiring from the powertrain control module to the sensor connector. You will have to unplug the connector at the PCM and measure the resistance of the circuit from end to end. You should see less than an ohm of resistance or very close to an ohm. A few ohm could be enough to cause a problem. This amount of resistance could be caused by a wire that is partially broken inside of the insulation. If this is the case the wire will need to be replaced.

If no problem is found with the wiring the problem is most likely a faulty powertrain control module. The powertrain control module controls the circuit by grounding the circuit. It is possible that over time the switch in the powertrain control module could build up corrosion or get burned. These will increase the resistance of the circuit and cause the P0057 trouble code to set.

Common mistakes when diagnosing the P0057 code

The most common mistake made when diagnosing this trouble code is simply assuming that the oxygen sensor is bad and replacing it without performing and diagnostics. The vast majority of the time the problem will be fixed, but there are situations when this doesn’t take care of it.

How serious is the P0057 code?

  • The P0057 code does not pose any risk to the vehicle.

  • Vehicle emission will be increased during a cold start but once the sensor is warmed up by the exhaust it will work normally.

What repairs can fix the P0057 code?

  • Replacing the bank two sensor two oxygen sensor would be the number one most popular repair for this code.

  • Next would be some sort of wiring or connector repair due to damage from road hazards.

  • Another possible repair would be replacing a faulty powertrain control module.

Need help with a P0057 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
P0057
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0057 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,860

Rating Summary
4,473
187
48
28
124
4,473
187
48
28
124

Albert

13 years of experience
22 reviews
Albert
13 years of experience
Ford Fusion - Check Engine Light is on - Riverside, California
Albert showed up early, was very professional and informative, would definitely recommend to family and friends

William

15 years of experience
9 reviews
William
15 years of experience
Ford Crown Victoria - Check Engine Light is on - Denver, Colorado
William was such a great help on helping me not only diagnose my vehicle but also helped me better understand my own Car! Such a great experience for my first time using Your Mechanic

Joseph

25 years of experience
498 reviews
Joseph
25 years of experience
Chevrolet Camaro - Check Engine Light is on - Katy, Texas
Joseph was early for my appointment! He explained everything that was easy for me to understand! I would highly recommend Joseph and Yourmechanic to everyone I know! Thanks, Joseph!

Omar

10 years of experience
279 reviews
Omar
10 years of experience
Toyota Camry - Check Engine Light is on - Fort Lauderdale, Florida
Omar arrived right on time. He was thorough in running through all of the points of the inspection, and when he found the cause of the check engine light, he explained it in detail. Thankfully, it was a minor issue and easy remedy. He noticed a few things that I needed to pay attention to and sent me an estimate for them. He was friendly, polite, and knowledgeable. I would recommend him highly.

More related articles

P0058 OBD-II trouble code: HO2S Heater Control Circuit High (Bank 2 Sensor 2)
P0058 P0058 trouble code definition The definition of the trouble code P0058 is heated oxygen sensor heater control circuit high voltage bank 2 sensor 2. What the P0058 code means When this code is stored in the powertrain control module...
P2337 OBD-II Trouble Code: Cylinder #2 Above Knock Threshold
P2337 P2337 code definition The P2337 trouble code signals a problem with the #2 cylinder being above the knock threshold. What the P2337 code means The P2337 code is a standard OBD-II trouble code that deals with the #2 cylinder...
P2040 OBD-II Trouble Code: Reductant Injection Air Pressure Sensor Circuit High Input
P2040 P2040 code definition Reductant Injection Air Pressure Sensor Circuit High Input* *Definition could differ depending on manufacturer code usage, for example, “Oil Quality Sensor ME-SFI” (Mercedes) What the P2040 code means P2040 is an OBD-II generic code for the...

Related questions

Check Engine light on; transmission leak

The coolant temperature sensor is likely what caused your Check Engine light. Sometimes aftermarket manufacturers produce parts of a lesser quality than the OEM. However, this does not mean that all aftermarket manufacturers produce faulty parts. It is harder to...

My truck runs for about 20 minutes and then dies. After few minutes starts back up. Changed fuel pump and few other things

Try cleaning the mass air flow sensor as these sometimes get dirty which can cause it to not run well or at all in some cases. Without additional detail as to what else has been changed, it is tough to...

I have a 2006volkswagen passat and was told that i needed my high pressure regulator pump replaced cause my car was not accelerati

If your vehicle's Check Engine Light, as well as Electronic Power Control - EPC - light are on, you should request a diagnostic to have the stored Trouble Codes read and evaluated. Diagnostics that follow up on the specific downloaded...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com