Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. P0050 OBD-II Trouble Code: HO2S Heater Control Circuit (Bank 2 Sensor 1)

P0050 OBD-II Trouble Code: HO2S Heater Control Circuit (Bank 2 Sensor 1)

check engine light logo

P0050 code definition

HO2S Heater Control Circuit (Bank 2 Sensor 1)

What the P0050 code means

This code is found when the Engine Control Module (ECM) has detected an issue with the heater control circuit for the bank 2, sensor 1 oxygen sensor. The heater circuit is used by the ECM to heat the oxygen sensor to proper operating temperature for an accurate reading. This code may be seen with P0051 and P0052.

What causes the P0050 code?

P0050 is a straightforward code with a few causes:

  • Bank 2, sensor 1 failure (most common)
  • Poor electrical connection
  • Engine Control Module failure
  • Open or short in the wiring

What are the symptoms of the P0050 code?

  • The Check Engine Light will be displayed on the vehicle's dashboard.
  • The car's fuel economy may be lowered and the engine may also run rough.

How does a mechanic diagnose the P0050 code?

A qualified mechanic will find diagnosis of P0050 to be a straightforward process as long as all steps are followed in the proper order.

  1. Installs a scanner into the DTC port (usually located under the dash)

  2. Observes the code P0050 and its associated freeze frame data

  3. Clears the code and performs a road test, recreating the operating conditions found in the freeze frame data

  4. Performs a visual inspection of the sensor's wiring

  5. Observes the sensor data to check for proper operation

  6. Inspects the car’s ECM and performs the manufacturer's specified tests

Common mistakes when diagnosing the P0050 code

  • Skipping parts that are necessary to diagnose code P0050 correctly
  • Replacing the sensor without any diagnostic testing (doesn't always solve the issue)

How serious is the P0050 code?

The most serious issues found with P0050 are worse fuel economy than normal and rough running. Typically, only the Check Engine Light on the dash is noticed by the driver.

What repairs can fix the P0050 code?

A few standard repairs fix P0050:

Additional comments for consideration regarding the P0050 code

As vehicles age, it is not uncommon for oxygen sensors to require replacement. Oxygen sensors must be diagnosed before they are replaced to avoid having to perform additional repairs. If a short is found, it is not uncommon to find a blown fuse. The fuse must be replaced in addition to any wiring repair. A blown fuse indicates a wiring issue in most cases.

Need help with a P0050 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How Long Does a Vacuum Brake Booster Check Valve Last?
The braking system on your car requires a lot of pressure. The vacuum booster is one of the main sources of this pressure. This booster will take the pressure that...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...


Related questions

Q: Car locked up

Your vehicle likely lost steering and braking because your engine shut down. You lose all power steering and braking when your engine loses power. As for the warning lights in the dash, I would recommend scanning your vehicles computer with...

Q: What parts will I need for a timing chain replacement and how many of each. Is my engine interference or non interference?

Hello - your engine does use a timing chain, and that engine is not an interference (valve-to-piston) engine. However, having said that - if the chain breaks, especially at anything above an idle, the broken chain can jam the crankshaft...

Q: Transmission shift solenoids

Hi there, thanks for writing in. Your particular car is very prone to complete transmission failure, so I would not personally attempt to make repairs to the transmission, as it likely won't fix the problem, or may act simply as...