Skip the auto shop - Our mechanics make house calls

P0063 OBD-II Trouble Code: HO2S Heater Control Circuit Low (Bank 2 Sensor 3)

P0063 trouble code definition

Trouble code P0062 indicates that the heater element used to heat up an oxygen sensor has malfunctioned. To switch on an oxygen sensor either a power or a ground is supplied to the sensor. A good ground connection and a voltage ranging from 12.0-13.5 are needed to operate the oxygen sensor.

The cause of the code is commonly due to the lack of either voltage or adequate ground supply. Each are equally important to successfully heat the oxygen sensor to its required operating temperature. An oxygen sensor is designed to work around 600-800 degrees Fahrenheit. With any other temperature than that, an oxygen sensor will not be able to accurately read the air-fuel ratio of the engine. Nor will it be able to log the amount of harmful pollutants that are being created by the engine.

What the P0063 code means

The code is commonly due to a low amount of voltage signal being sent from the oxygen sensor to the PCM. The PCM sends a voltage to the heater circuit of the oxygen sensor to warm it up to a desirable temperature.The sensor will emit to the PCM a certain resistance and voltage according to the amounts of gasses and air that the sensor is picking up.

The PCM will take the readings of the oxygen sensor to determine if the air-fuel ratio of the engine is within the desirable range of 14.7:1. If the voltage being sent by the oxygen sensor is lower than that of the PCM’s desired range, code P0063 will set. If the code sets there is a low voltage being emitted by the oxygen sensor.

What causes the P0063 code?

  • An internal oxygen sensor circuit fault

  • High resistance or voltage consumption of the heater element inside of the oxygen sensor

  • A frayed wire, corroded connection, exposed or open wiring

What are the symptoms of the P0063 code?

  • Usually there are no symptoms besides a Check Engine Light being set.

  • In rare cases the vehicle may struggle to idle or hesitate to accelerate.

How does a mechanic diagnose the P0063 code?

  • Back probes the oxygen sensor to compare the readings to manufactures specifications

  • Checks the related wiring and connections of the oxygen sensor

Common mistakes when diagnosing the P0063 code

  • Not checking for blown fuses

  • Replacing the sensor before cleaning the electrical contacts then remeasuring

  • Replacing the sensor without measuring the outputs of the sensor, such as volts and resistances.

How serious is the P0063 code?

  • The code will increase the amount of pollutants being emitted into the atmosphere.

  • Also increases the amount of fuel consumption which is harmful to the environment.

  • An increase in fuel consumption will affect how much you pay at the pump.

What repairs can fix the P0063 code?

  • Replacing the oxygen sensor will most likely clear the code
  • Repairing or replacing of the damaged or oil saturated wiring and connections
  • Replacing the PCM
  • Reprogramming of the PCM (if applicable)

Additional comments for consideration regarding the P0063 code?

Always measure the voltage output and resistance of the oxygen sensor and compare it with the manufactures specifications

Need help with a P0063 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 Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Long Does a Fuel Filler Neck Last?
Getting gas from the pump to your gas tank is the only way to keep a car going. The fuel filler neck is a metal tube that is welded to the...
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...


Related questions

Q: P1810 Pressure Manifold Fault

If you have code P1810, then this might be something wrong with the transmission control valve for the gear position sensor, or a compatibility problem between the different computers. Have a pinpoint test for the code done and see if...

Q: How to repair the P2238 trouble code in my car

Hi there. This P2238 code is set when the engine computer detects a short circuit on the heater for the 02 or AF sensor.The short is generally in the sensor itself and replacement corrects the condition. However, there could be...

Q: I have a P2771 code.

This code may be the result of a malfunctioning selector switch or an electrical problem within the circuit. The fault may not necessarily be in the transfer case itself, but the electronics can be tested. Consider hiring an experienced technician...