Skip the auto shop - Our mechanics make house calls

Q: Codes p0136, P0141

asked by on

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Codes p0136, P0141

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

Q: Fluctuating coolant readings

Hello. Your fluctuating coolant temperature may be caused by a cracked cylinder head or leaking head gasket. It sounds like you have replaced everything else that could be causing this issue. If the head is cracked or the head gasket...

Q: Check engine light is on. O2 oxygen sencer p0136 also other codes all with o2 sencer. Replaced all 4 but still have engin light.

Hello, thank you for this. The P0136 diagnostic code stands for a circuit malfunction. This means the sensor is not giving any information to the computer and no signal is detected. There is no relay for the circuit. The best...

Q: Are the variable valve timing solenoid and the camshaft sensor the same?

Hello. The variable valve timing and the camshaft position sensor are two separate sensors. The camshaft position sensor is more towards the front of the engine and is a lot easier to replace. The variable valve timing sensor is a...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...