P0136 – Meaning, Causes, Symptoms, & Fixes

Code P0136 Definition

Oxygen Sensor Circuit Malfunction (Bank 1, Sensor 2)

What Does P0136 Mean?

Your car has oxygen (O2) sensors that measure the amount of oxygen present in your exhaust. Based on the measurements taken, the O2 sensor will fluctuate between a high(rich) and low(lean) voltage reading. Your Engine Control Module (ECM) uses the voltage levels provided by your O2 sensors to regulate your engine’s fuel injector pulse. If you are seeing code P0136, it means that the O2 sensor behind your catalytic converter on bank 1 is malfunctioning.

What Are The Symptoms Of Code P0136?*

  • Check Engine Light
  • Decrease in MPG
  • Increased tailpipe emissions

*No noticeable adverse conditions in some cases

What Is The Cause Of Code P0136?

  • Faulty Bank 1 O2 sensor 2
  • Exhaust leak in front of sensor 2
  • Intake Leak
  • Corrosion in connecter
  • Frayed or broken wiring

How Severe Is Code P0136? – Moderate

Driving with trouble code P0136 is acceptable but only for a short period of time. Driving with this code for an elongated period of time could result in greater engine or catalyst damage.

Code P0136 Common Diagnosis Mistakes

Replacing the O2 sensor without checking for any intake or exhaust leaks or loose connections.

Tools Needed to Diagnose:

How To Diagnose And Repair Code P0136?

Difficulty of Diagnosis and Repair – (2 out of 5)

  1. A sensor is needed for this next action, and the FIXD Sensor is perfect for it. Scan codes and document freeze frame data then clear codes to verify failure.
  2. Note if the O2 sensor is rapidly or slowly switching from low to high voltage. This could indicate a faulty O2 sensor.
  3. Check for any broken or shorted wiring in relation to the O2 sensor. If there is any broken or shorted wiring, make sure to repair or replace it.
  4. Check for any vacuum leaks in the engine or any holes in the exhaust that could lead to air escaping from the engine. Repair any leaks or holes you find.
  5. At this point, if there are no intake or exhaust leaks, you should replace the bank 2 sensor 2 oxygen sensor.

Estimated Cost of Repair

For error code P0136, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair. 

  • Oxygen sensor $200-$300
  • Exhaust repair $100-$200 (if welded to repair)
  • Vacuum leak $100-$200

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Comments 12

Ryan

September 10, 2018

Needed diagnostic info for a similar (yet different) P0137 CEL code

FIXD Marketing

September 10, 2018

No problem Ryan! Here is a link for our article on Check Engine Light code P0137.

https://www.fixdapp.com/blog/p0137

I dhandy

December 4, 2018

How much to replace all O2 sensor for 1999 ml 320 ?? Parts and labor ??

Danny mann

September 15, 2018

My car was running fine ,but check engine light was ,on b4 I got the car some one had a home made cold air intake on it ,I replaced it the other day with the proper one ,no air leaks etc,its properly but afterwards, car idles norm but will shut off sometimes when slowing and hesitating sometimes in 5th gear when at cruising speed 40/45 mph had it code checked and got PO137, OXY SENSOR BANK1 SENSOR 2 LOW VOLT, PO138 OXY SENSOR BANK 1 SENSOR 2 HIGH VOLT ,P1235 ,AND PO300 ,

Victor M Martinez

December 3, 2018

Please show me where is located the catalytic 02 sensor for my Dodge Ram 1500 2003 4.7 engine. Also need to now where is located the vacuum.

brian polidori

December 18, 2018

I’m getting this code, I have the FIXD app and device, I cleared the code, will I fail emissions test with this code popping up?

FIXD Marketing

December 18, 2018

Hello Brian,

If the code is emissions related, it cannot be cleared by a scanner. The light will come back on if the problem persists. It is recommended to have this code repaired as soon as possible as continuing to drive could risk greater damage to your vehicle’s engine.

I hope this helps!

Chris Allridge

April 19, 2019

I had a dirty mass air flow sensor that caused this error.

tony

November 5, 2019

which code are you referring to :p0136 or p0137? My highlander has a new rear oxygen sensor and I still got p0136. thanks,

Con

May 30, 2019

Where is the O2 sensor located on my Ford Escape 2003?
Many thanks

James Morris

June 7, 2019

Where are the 4 O2 sensors located on a 2013 Nissan Pathfinder?

TILMAN RAWLS

June 11, 2019

PO137 Bank 1 SENSOR

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