Skip the auto shop - Our mechanics make house calls

P0059 OBD-II Trouble Code: Heater Circuit Resistance (Bank 2 Sensor 1)

Check Engine Light

P0059 trouble code definition

The definition of diagnostic trouble code p0059 is that the resistance for the heater circuit of bank 2 sensor 1 oxygen sensor is not correct.

What the P0059 code means

When this trouble code sets it means there is some sort of malfunction in the heater circuit for the bank 2 sensor 1 oxygen sensor. This most likely means that the heater is non-operational.

What causes the P0059 code?

  • The powertrain control module continually monitors the heater circuit for all the oxygen sensors on the car. When it detects that the resistance is incorrect P0059 can set for the bank 2 sensor 1 oxygen sensor.

  • There could be a problem with the wiring for the circuit or the oxygen sensor may have failed internally causing the resistance for the circuit to be incorrect.

What are the symptoms of the P0059 code?

The only symptom you will notice is that the Check Engine Light will be illuminated signifying that there is a problem with your car. When the heater circuit in an oxygen sensor fails, it means that it will take longer to get to its operating temperature. This means emissions can be increased during cold starts.

Any time there is a fault where vehicle emissions will be increased by one and a half times and the Check Engine Light must illuminate as mandated by the federal government.

How does a mechanic diagnose the P0059 code?

  • To start off, I will usually do a quick visual inspection of the oxygen sensor harnesses for any obvious signs of damage. If there is any visible damage found it must be corrected before further diagnostics can be performed. The damage is likely the source of the trouble code setting.

  • If no damage is found I will measure the resistance of the heater circuit in the oxygen sensor itself. The service manual will have a specification for what the resistance should be. If the sensor reads out of specification you have found the problem.

  • If the sensor checks out ok I will connect a test lamp into the vehicle side of oxygen sensor heater circuit (as opposed to the oxygen sensor harness itself). If the test light shines bright it confirms that the heater circuit is functioning normally.

  • If the sensor tests normal and the vehicle side tests ok with the test light, it is time to take a close look at the connection between the vehicle side of the harness and the oxygen sensor harness.

  • There could be corrosion or damage to the terminals that is causing a poor connection and causing P0059 to set.

Common mistakes when diagnosing the P0059 code

By far, the most common “mistake” is simply replacing the bank 2 sensor 1 oxygen sensor without performing and diagnostics at all. This happens a lot because the vast majority of the time it is the sensor itself that has failed. The sensor is heated to 500 degrees fahrenheit every time the car is turned on. As you could imagine that is a lot of stress. It’s a high failure item so it can be easy to get lazy and just replace the sensor.

Another common mistake is measuring the wrong terminals in the connectors. It is important to know how to read the wiring diagrams so you know you are measuring the correct circuits.

How serious is the P0059 code?

This is not a very serious code. Other than the fact that you will not pass an emissions test, you will not notice any real drivability problems.

What repairs can fix the P0100 code?

  • As stated earlier the most common repair is replacing a faulty oxygen sensor.

  • After the sensor itself the next most common repair is fixing a problem in the wiring that may have been caused by some road debris or the harness being misrouted and getting chaffed through.

Need help with a P0100 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 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,...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...


Related questions

Q: Car turned off service engine light and slip light came on

The slip light would not be caused by a crank sensor. A slip light usually involves a sensor like the speed sensor, or a transmission problem. The Check Engine Light may also be due to a code from the transmission....

Q: My truck runs for about 20 minutes and then dies. After few minutes starts back up. Changed fuel pump and few other things

Try cleaning the mass air flow sensor as these sometimes get dirty which can cause it to not run well or at all in some cases. Without additional detail as to what else has been changed, it is tough to...

Q: Kia Sporate Engine check light issue and car stalled this morning!

The infamous "loose gas cap code" is P0442. P0434 is an issue with a heated catalytic converter not coming up to temperature quickly enough. It can be caused by the fuel injection being too rich. If you starter is not...