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?

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.

Was this answer helpful?
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

Get a quote

What others are asking

The car has trouble cranking unless i push the key in hard and wiggle it.

If you are having no issues turning the key in the ignition lock, the lock assembly should be okay and the actuator pin that links the lock cylinder to the switch may be the problem. Pushing the key in hard...

Will a home code reader/scanner let me fix my car?

Aftermarket code readers and scanners cannot, by themselves, be used to fix your car. The scanner is used to retrieve diagnostic trouble codes (DTCs) from the various control modules on the vehicle. After using your scanner to retrieve DTCs, you...

Splash shield came off

Hi. Your splash shield is connected to the car with clips that may have come loose. It should be able to be re-attached. I would recommend having a technician from YourMechanic come out and re-attach the splash shield for you...

Related articles

What's the Difference Between a Code Reader and a Code Scanner?
In In order to determine why your Check Engine Light is on, a mechanic will connect a handheld device to the OBD II connector under your dash (in a vehicle made in 1996 and onward). This lets the mechanic access...
How Do Sensors Get Dirty or Damaged?
Car sensors measure and relay vital information to the ECU. Some sensors can get dirty from normal use, or fail if the car overheats or has a problem.
Symptoms of a Bad or Failing Manifold Temperature Sensor
Common signs include a rough idle, lack of power, high NOx production, and emissions test failure.