Skip the auto shop - Our mechanics make house calls

P0167 OBD-II trouble CodeO2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 3)

Check Engine Light

P0167 code definition

O2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 3)

What P0167 code means

Many oxygen sensors are heated now in order to bring them to operating temperature more quickly. If any of the wiring in the heater circuit for this oxygen sensor is damaged this trouble code may appear.

What are the causes of the P0167 code?

  • Damaged wiring in the heater circuit
  • Faulty oxygen sensor

What are the symptoms of the P0167 code?

When the engine is first started, the engine’s fuel system is running in what is called “open loop”. During “open loop,” more fuel is used to keep the engine running (a rich condition) due to the fact that the air/fuel ratios are running on a pre-determined specification programmed into the powertrain control module by the manufacturer.

When the oxygen sensors have heated up to operating temperature, they begin to produce a signal voltage that is sent to the powertrain control module. When this happens, the engine goes into “closed loop.” This is where the powertrain control module will adjust the air/fuel ratio based off of the readings given by the oxygen sensors. If the heater circuit for the oxygen sensor is damaged, the sensor may never reach operating temperature causing decreased fuel economy and bad emissions.

How does a mechanic diagnose the P0167 code?

A mechanic would likely start the diagnosis of the P0167 code by taking a look at the third oxygen sensor in the second bank of the exhaust to check for any burned or damaged wiring coming from the sensor.

This is the most common cause of this code. If the wiring for the circuit looks fine, the problem likely lies in the sensor itself.

At this point, the mechanic would then test the oxygen sensor for proper function using the manufacturer’s specific procedure. If the sensor turns out to be functional, the problem lies in the powertrain control module.

Common mistakes when diagnosing the P0167 code

Just like any other trouble code that uses the words O2 sensor, the most common mistake that could be made in this circumstance would be to replace the oxygen sensor as the first step.

Some people think that, just because “oxygen sensor” is named in the trouble code, then this means that the part will automatically need to be replaced. This often leads to a misdiagnosis and wasted money.

How serious is the P0167 code?

The P0167 code can be lived with for a short time. Considering that this code is related to the third oxygen sensor in the second bank of the exhaust, the powertrain control module should still be receiving a signal from the five other oxygen sensors.

With the signals remaining, the powertrain control module should be able to maintain a correct air/fuel ratio for a period of time. It would still be wise to have this problem diagnosed and repaired as soon as possible.

What repairs can fix the P0167 code?

Additional comments regarding the P0167 code

The powertrain control module is a rare failure and everything else should be confirmed to be functional before replacing the powertrain control module. The most common causes of this trouble code are a faulty oxygen sensor or damaged wiring associated with the heater circuit of the oxygen sensor.

Need help with a P0167 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

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...


Related questions

Q: Can't pass smog check due to Check Engine light

The Check Engine light requires a special scan tool to determine the issue. Additional diagnostics may be required. An intake leak is common on this engine and may cause leaks, low fluids, and many other issues. With the vehicle sitting...

Q: Throttle Position Sensor

Anytime you go to a parts store to get a computer scan for the Check Engine Light you are not getting a diagnosis of the problem but only a code retrieved from the engine control module (ECM) memory. This is...

Q: My Check Engine Light is on and will not turn off

It is possible that the recirculation of the oil back into the intake could be causing an issue, if the amount is excessive. However, without reading any troubleshooting codes, there would be no way to confirm why the Check Engine...