Skip the auto shop - Our mechanics make house calls

P0162 OBD-II Trouble Code: Sensor Circuit Malfunction (Bank 2, Sensor 3)

Check Engine Light

P0162 code definition

Trouble code P0162 is set when a malfunction is detected on the bank 2 sensor 3 oxygen sensor circuit.

What the P0162 code means

Bank 2 refers to the side of the engine opposite of cylinder number one. Sensor 3 means that it is the third sensor in the exhaust, which usually monitors the efficiency of the catalytic converter.

This code means that the powertrain control module has detected a fault in the circuit for the oxygen sensor for bank 2 sensor 3. The Check Engine Light will illuminate to let the owner know that there is a problem with the emissions system.

What causes the P0162 code?

Trouble code P0162 sets when the engine management computer does not detect any activity on the oxygen sensor circuit for bank 2 sensor 3.

Generally, an oxygen sensor’s voltage will vary up and down. The first sensor in the exhaust varies voltage very quickly and the voltage variance is greater.

The second sensor varies slower and the voltage variance is smaller due to the catalyst in the exhaust.

When the computer detects that there is no activity, or variance, in the voltage it sees this as a problem and sets this error code.

What are the symptoms of the P0162 code?

The main symptom for this code is that the Check Engine Light coming on. There are no drivability problems typically associated when this code sets.

How does a mechanic diagnose the P0162 code?

  • As with any oxygen sensor code, the technician will perform a visual check of the oxygen sensor harness to check for any obvious signs of damage. These wires are under the vehicle and are susceptible to damage by road hazards.

  • Next, they will check the terminals of the connector for any signs of corrosion or water intrusion. These will cause the voltage readings to be incorrect causing an error code.

  • Next, they will check the resistance of the oxygen sensor itself and make sure it is within specifications.

  • After the oxygen sensor resistance is checked, they will need to measure the reference voltage from the powertrain control module.

  • If all of these checks turn out okay, it is most likely a faulty oxygen sensor.

  • A quick way to check for this is to monitor the voltage of the sensor with a scan tool and either introduce a vaccuum leak or an extra fuel source to the vehicle.

This should change the voltage reading to one extreme or the other for the sensor. If there is no change this confirms that the sensor is not reading correctly.

Common mistakes when diagnosing the P0162 code

The most common mistake would be replacing the oxygen sensor without performing any diagnostics. Without performing an inspection, you may replace the sensor without actually fixing the problem.

The next common problem would be be replacing the wrong sensor. Depending on the engine configuration it is possible to get the cylinder banks confused if you do not consult the service information for the vehicle you are working on.

How serious is the P0162 code?

There will be no drivability concerns related to this trouble code. However, this trouble code will cause you to fail an emissions test if test equipment is connected to the engine computer to check for codes. If they run your car on a dyno there is a possibility that your car may pass the test as long as there are no other issues.

What repairs can fix the P0162 code?

The most common repair is replacing the faulty oxygen sensor. After that, I would say that wiring repairs are the next most common repair for this trouble code.

Need help with a P0162 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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP)...
Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...


Related questions

Q: U1262 scp data link fault

The code U1262 point out a communication fault between the vehicle modules and a scanner. It may be best to visit your local dealer to find if one of the vehicles control modules has failed. In some cases this can...

Q: Multiple problems on a 1996 Jeep Grand Cherokee

Hi there. From the description you have provided, there are multiple problems going on with your vehicle, so the faults may or may not be related. Although the car is showing many symptoms, this may not be terminal. It could...

Q: Check Engine Light came on. Car also has problems cranking but only when I refill it with gas.

Hi there - the first thing to do is extract the problem code(s) which are setting the "Check Engine" light. This will more efficiently direct resolution of the problem. Evaporative emission system problems are often associated with "fill-up" issues like...