Skip the auto shop - Our mechanics make house calls

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 Throttle Return Spring Last?
Not all vehicles on the road feature an electronic throttle control (ETC), which is also called drive-by-wire. For vehicles that don't offer this system, they have a throttle cable instead that...
How to Find the Keyless Code on a Ford Explorer or Mercury Mountaineer
Many Ford Explorers and Mercury Mountaineers were manufactured with an option known as the Ford keyless entry keypad. Some models refer to it as SecuriCode as well. It...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...


Related questions

Q: Check Engine Light comes on in hot weather

Hello. The Check Engine Light will come on any time that the computer sees a problem with the powertrain in the vehicle. In order to know where the issue is coming from I would need to scan the computer for...

Q: power shuts down,but will run and drive very slow

For issues like this you should have the system computer scanned and have any codes diagnosed by a mechanic. The cost to have the problem properly diagnosed far out weighs throwing parts at the problem hoping to fix it. The...

Q: Trouble code P0133 - 2002 Dodge Durango

Do you know if there are any exhaust leaks before the sensor? This code trips when the O2 sensor is not switching back an forth between rich and lean as fast as the computer is setting the conditions. This can...