Hello!,good afternoon. In this article you will see a description of fuses and relays Error P0136 – how to fix?
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Code definition P0136
O2 Sensor Circuit Malfunction (Bank 1, Sensor 2)
What does the code P0136 mean?
P0136 is a general OBD-II code indicating that the bank 1 O2 sensor is not within the minimum and maximum voltage calibrated limits for the ECM.
What causes the code P0136?
- The ECM monitors the O2 sensor high and low voltages. This code appears when the voltage limits do not fall within the specifications programmed into the ECM.
- The ECM detects a voltage problem and turns on the Check Engine light.
- The ECM uses other O2 sensors to try to control fuel injection with known values.
- There is a leak in the exhaust system or a damaged catalyst in front of the sensor.
What are the symptoms of the P0136 code?
- The engine can run with an excessively rich composition if it goes into open circuit.
- If the spark plugs become dirty over time, the engine may stop working.
- The Check Engine light will come on.
- You may have exhaust gas leaks or loss of power due to a clogged or damaged catalytic converter.
How does the mechanic diagnose the P0136 code?
- Scan the codes and document the data from the frozen frame, then erase the codes to verify the fault.
- Monitor the O2 sensor data to see if the voltage is changing between low and high at a rapid rate compared to other sensors.
- Check the O2 sensor wiring and harness connections for corrosion.
- Check the O2 sensor heating circuit for proper resistance as per specification.
- Check for exhaust gas leaks upstream of the sensor.
- For further diagnostics, spot tests recommended by the manufacturer should be performed.
The most common errors when diagnosing the P0136 code
Follow these simple tips to avoid misdiagnosis:
- Repair any leak in the exhaust system upstream of the sensor to avoid incorrect readings.
- Check the O2 sensor for contamination by oil or coolant from engine leaks.
- Repair damaged harnesses properly, taking no shortcuts to avoid repeated failures.
- Check that the removed O2 sensor is not damaged by a faulty catalytic converter and replace the catalytic converter if it is faulty.
How serious is the P0136 code?
- The O2 sensor output voltage can indicate problems with the engine and exhaust system that are causing the O2 sensors to provide erratic output voltages.
- The O2 sensor may not read properly if the catalytic converter is damaged in front of the sensor.
- The ECM can remain in open loop until the O2 system is repaired or the O2 sensor starts working again, causing abundant long-term conditions that could possibly damage other engine components.
What repairs can fix the code P0136?
- Replace O2 sensor in bank 1 sensor 2.
- Repair or replace wiring or connection to O2 sensor for bank 1 of sensor 2
- Repair the exhaust leaks or the damaged catalytic converter
Additional notes regarding code P0136
The bank 1 sensor 2 O2 sensor circuit is used to provide voltage feedback to the ECM for fuel control and catalyst performance information.