Toyota Camry P0141 Trouble Code – Test your Oxygen Sensor

The downstream oxygen sensor is also known as the secondary 02 sensor or rear oxygen sensor. When this sensor goes bad you are going to see a OBDII stored code in your Toyota. The Toyota Camry P0141 OBDII trouble code is one that indicates a problem with the downstream 02 sensor. This sensor is not meant to provide engine or fuel management values to your Toyota computer, but rather tell your Powertrain Control Module (PCM) that the catalytic converter is working properly.

The specific language for the Toyota Camry P0141 check engine code is Oxygen 02 Sensor Heater Circuit Malfunction for the Bank1 – Sensor 2 02 sensor. Sensor 2 is the downstream oxygen sensor and today I’ll be showing you how to test this 02 sensor in a 2000 Toyota Camry with the 2.2 liter engine in it. When your 2.2 liter Toyota Camry has a check engine light turned on, you’ll need to use the right OBDII scan tool to get the code in question.

Toyota Camry P0141 Trouble Code – Test your Oxygen Sensor

In order to test your downstream oxygen sensor, you’ll need to raise your Toyota Camry up and secure it on jackstands if you don’t have access to a automotive lift. Never attempt to work on this sensor if you are not sure what you are doing or you don’t have the proper safety equipment. In order to test your secondary oxygen sensor, you’ll need to use a digital multimeter to test the circuits.

The four wire rear Toyota 02 sensor is a easily disconnected, and located after your catalytic converter. Once you’ve got this sensor disconnected, put in your Toyota key and turn the ignition to the “ON” position. Don’t forget that the Toyota Camry P0141 is for your rear 02 sensor, not the front or primary / upstream oxygen sensor.

Toyota Camry P0141 Trouble Code – Test your Oxygen Sensor 2

Testing your Toyota Camry downstream oxygen sensor

There’s two primary grounds that should be checked first and foremost. Using your multimeter, disconnect and probe the Toyota harness side of the downstream 02 sensor. Remember you are not testing the sensor loom or the sensor itself here. Gently touch the multimeter lead to PIN A on the engine harness side, which is a PINK wire with a BLACK stripe in it. This represents your downstream oxygen sensor heater ground.

The next wire to move to is the PIN D on the engine harness side of your Toyota. This is the primary ground signal or low reference wire sent by your Toyota PCM. The wire for PIN D is a BROWN wire and there should be a ground signal here.

Toyota Camry downstream oxygen sensor

Once you’ve tested both of those move onto PIN B on the ENGINE harness side. This should be a switched power signal and the wire should be BLACK with a YELLOW stripe in it. Now if you have power and ground at these three terminals the last part of the test is to check the internal resistance of your rear 02 sensor.

Testing your downstream 02 sensor – Toyota Camry P0141

With your multimeter turned to read OHMS or resistance, now gently test both PIN A and PIN B on the OXYGEN SENSOR side. Testing these two pins should return a base resistance that will show you if the downstream oxygen sensor is any good or not. The downstream Toyota 02 sensor should read between 11 to 16 Ω worth of resistance.

If your rear Camry 02 sensor doesn’t return these values at these terminals, it’s time for a rear 02 sensor replacement. Once you have replaced the rear or downstream oxygen sensor you can use a OBDII scan tool to erase your Toyota Camry P0141 OBDII trouble code. Have any questions about this guide? Leave me a comment below and let us know!

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