Q: Codes p0136, P0141

asked by on August 23, 2016

My car has 57,500 miles on it. Code p0136 – O2 Sensor Ban1 Sensor 2 – came on. So I bought a new one at the auto parts store and put it in. I reset the code and drove for about 25 miles. But then I got a P0141 - same unit heater malfunction. I told the supplier and got a free replacement. I put it in the free replacement, cleared the code and about 20 minutes later after driving the code came up again. Do you have any suggestions?

Oxygen Sensor Replacement $108.80 - $869.59 Get a Quote
Check Engine Light is on Inspection $79.99 - $89.99 Get a Quote

Although these codes are both for the downstream O2 sensor, they are completely different. The first code, P0136, has to do with actual sensor performance. The second code, P0141, has to do with the sensor heater circuit performance.

The hybrid vehicle control ECU will turn on the heater for a brief period during a cold start to bring the sensor up to operating temperature. The O2 sensor itself sends a signal back to the hybrid vehicle control ECU to keep it apprised of catalytic converter performance.

In other words, these codes are for two separate circuits. The only thing these two codes have in common is are the ECU and the O2 sensor itself.

Since you’ve already replaced the sensor, all signs point towards the ECU. The good news is, the ECU probably does not need to be replaced. There is a technical service bulletin (TSB) for updating the module when code P0136 is set. The number TSB number is L-TCI-3140.

A trained professional, like one from YourMechanic, will have an OEM scanner and can diagnose these codes and perform the appropriate repairs for you.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Door open/ajar sensor will not turn off .

You may have a worn door latch. With someone in the driver's seat watching the light, close the driver's side door, and push in on the door evenly with the latch to see if the light goes out. If it...

My drivers side back break grinds when I press the break. Do I need to replace my breaks

Typically, the grinding sound indicates that the material on the brake pads has ground down to a minimal amount resulting in the grinding sound you are hearing. I would suggest having a professional from YourMechanic come to your location to...

is it possible to put crankshaft sensor where canshaft sensir goes, and visa versa?

For the question as to whether or not you can put the camshaft and crankshaft sensors into the wrong orifice, I don't see this being possible. The physical dimensions would be close, but the protrusion of the sensor pickup should...

Tapping noise when accelerating. 2010 Nissan Altima

Hi there - engine tapping noises under load are usually connecting rod bearing problems, although it is possible that it's just a weak valve lifter. Hard to say without hearing it. If you have a sound byte to pass to...

Where is the ambient air temperature sensor located in a 94 Lincoln town car

The ambient air temperature sensor is located in front of the a/c condenser in the center of the vehicle mounted just below the hood latch on the support bracket. The sensor will give temperature reading s from about -40 to...

Over heating

Hello. Thank you for writing in. It sounds like you need to replace the thermostat housing, and possibly the thermostat as well. The temperature gauge on your dashboard is commonly misunderstood. The thermostat and temperature gauge will only give you...

How does the automatic climate control system detect the temperature?

In order for the automatic climate control system to work, it needs to know the temperature inside, as well as the temperature/amount of sunlight entering the cabin. It gets this information from two sensors. Sunlight Sensor: The sunlight sensor...

Cooling fan not coming on

Most of the time when the fan stops coming on it is caused by a fan failure. If the fan stops working it means that either the motor in the fan failed or it blew a fuse. If it blew...

My van was missing and rough idling then I turned it off one day and the next day it starts then dies and some times it won't start

Hello, thanks for writing in about your 2001 Dodge Caravan. For certain, given your mileage and codes for these 2 components, replacing these 2 sensors is the minimum. Cleaning the idle air control valve, throttle body, and PCV valve should...

Related articles

Symptoms of a Bad or Failing Throttle/Accelerator Pedal Position Sensor
Common signs of a faulty pedal position sensor include inconsistent engine response, reduced fuel efficiency, and the Check Engine Light coming on.
Symptoms of a Bad or Failing Barometric Sensor
Common signs include poor engine performance, like sluggish acceleration, lack of power, and misfires, as well as the Check Engine Light turning on.
Symptoms of a Bad or Failing EVP Position Sensor
Common signs include poor cold start performance, the Check Engine Light coming on, and failing an emissions test.