How do I fix code po139?
How do I fix code po139?
What repairs can fix the P0139 code?
- The O2 sensor for bank 1 sensor 2 should be replaced only after all other checks of the fuel and exhaust systems test okay.
- Testing the fuel system and replacing a leaking injector.
- Replacing the catalyst in front of the sensor.
What does p0139 mean on an oxygen sensor?
Error Code P0139 is described as Oxygen Sensor Circuit Slow Response Bank 1, Sensor 2. Meaning, the O2 Sensor Bank 1, Sensor 2 has failed to deliver a voltage drop of 0.2V for 7 seconds at deceleration fuel cut off. It tells the PCM (powertrain control module, also known as ECM or engine control module) that the sensor is responding too slowly.
When to set the O2 sensor trouble code?
The ECM cuts all fuel to the engine during deceleration of the engine and the O2 sensors all should respond with a voltage output below .2 volts showing the exhaust stream is high in oxygen content. The code is set if the O2 sensor for bank 1 sensor 2 does not respond to the fuel cutoff for 7 seconds or more.
What does p0139 stand for on a PCM?
If the rear sensor’s signal is slow to change or does not change at all, the PCM may log code P0139. Note: The definition of code P0139 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.
What causes engine to stall with p0139 code?
This can be caused by excessive fuel still in the exhaust stream from possible leaking in the fuel injection system. What are the symptoms of the P0139 code? The engine may stall or run rough on deceleration if excessive fuel is getting in the engine.
What is the p0139 code on the O2 sensor?
The P0139 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor takes more time to respond between rich and lean than the specified time. The Heated Oxygen Sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank.
What are the possible causes of Honda p0139?
P0139 Honda Possible Causes. Faulty Rear Heated Oxygen Sensor Bank 1. Rear Heated Oxygen Sensor Bank 1 harness is open or shorted. Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection. Inappropriate fuel pressure. Faulty fuel injectors. Intake air leaks may be faulty.
If the rear sensor’s signal is slow to change or does not change at all, the PCM may log code P0139. Note: The definition of code P0139 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.
What is diagnostic code for rear oxygen sensor?
It indicates that the powertrain control module (PCM) has detected a potential issue with the signal from the rear oxygen sensor on bank 1. Diagnostic trouble code P0139 indicates that the powertrain control module (PCM) has detected a potential issue with the signal from the rear oxygen sensor on bank 1.
