Diagnostic Code P0141: O2 Sensor Heater Circuit Malfunction

When your OBD-II reads trouble code P0141, discover how to diagnose the cause and find a solution. If you’re unsure where to start, find out how do I fix trouble code P0141? This generic error code applies to most vehicles, but you should consult your service manual to learn more about components specific to your make and model vehicle.

What Is an O2 Sensor Heater?

You’re probably wondering, what does the code P0141 mean? This code is triggered when it takes too long for the oxygen sensor on bank one to respond to the change in temperature. Under normal operation, your O2 sensor heater adjusts the operating temperature of the heater. This allows an accurate reading and prevents an open loop.

When your O2 sensor heater takes longer than a specified amount of time, your engine control module will alert you with trouble code P0141. This trouble code typically points to a damaged sensor heater or related wiring. Similar trouble codes include P0135 and P0420. These error codes also indicate an issue in an oxygen sensor, so it’s essential to inspect each sensor and relevant system.

Symptoms of a Sensor Circuit Malfunction

Because the oxygen sensor heater has an excessive current draw, your oxygen sensor may not be working properly. This could affect the fuel economy of your vehicle and will illuminate the Check Engine light. Although rare, this code could also be a sign of damage to your engine control module or other system. This would alert other trouble codes and come with additional symptoms that would affect your driving performance.

Other common symptoms include your engine running excessively rich. This is the result of an engine running in open loop. Your engine may also run rough due to the oxygen sensor issue. It’s important to determine the cause quickly and find a workable solution.

Typical Causes

An error code P0141 is likely caused by a fault in your vehicle’s electrical system. Inspect each of these electrical components to determine the cause of the issue:

  • Wire harness
  • O2 sensor
  • O2 sensor heater
  • Electrical connectors

Any short, open circuit, loose connection or frayed wire could result in trouble code P0141. Unlike other oxygen sensor trouble codes, a clogged or damaged catalytic converter usually isn’t the cause of P0141. Trouble with your converter typically signals error code P0420.

Test your oxygen sensor and any related connections for a short or other damage. Start with a visual inspection and then use a voltmeter to check the resistance in the wiring.


The most common solution for an error code P0141 is to replace your oxygen sensor on bank one. Whether there’s a short in the sensor or the sensor heater, any internal damage in your sensor requires a complete sensor replacement.

After you replace the sensor, you’ll need to clear the code and start your vehicle. Check to see if your new sensor heater is operating effectively. If you see error code P0141 again, you know that there’s still an issue with your oxygen sensor system.

If you can’t find any damage on the oxygen sensor itself, there may be a loose connection or a frayed wire in the wire harness. Repair or replace any faulty length of wiring. Inspect and replace any faulty wire connectors. Even a small tear in the wire harness can allow moisture to enter the harness and create a short.
Very rarely, your OBD-II scanner error code P0141 problem could also be the result of damage to your engine control module. In that case, you’ll need to inspect the module and relevant wiring to repair or replace any damaged components. Repairing the issue should clear your trouble and restore your fuel economy.

Advice, how-to guides, and car care information featured on and AutoZone Advice & How-To’s are presented as helpful resources for general maintenance and automotive repairs from a general perspective only and should be used at your own risk. Information is accurate and true to the best of AutoZone’s knowledge, however, there may be omissions, errors or mistakes.

Be sure to consult your owner’s manual, a repair guide, an AutoZoner at a store near you, or a licensed, professional mechanic for vehicle-specific repair information. Refer to the service manual for specific diagnostic, repair and tool information for your particular vehicle. Always chock your wheels prior to lifting a vehicle. Always disconnect the negative battery cable before servicing an electrical application on the vehicle to protect its electrical circuits in the event that a wire is accidentally pierced or grounded. Use caution when working with automotive batteries. Sulfuric acid is caustic and can burn clothing and skin or cause blindness. Always wear gloves and safety glasses and other personal protection equipment, and work in a well-ventilated area. Should electrolyte get on your body or clothing, neutralize it immediately with a solution of baking soda and water. Do not wear ties or loose clothing when working on your vehicle.

FREE Loan-A-Tool® program requires returnable deposit. Please note that the tool that you receive after placing an online order may be in a used but operable condition due to the nature of the Loan-A-Tool® program.

Related Posts