How do I fix code P0139?
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.
How do I fix code P0171?
What repairs can fix the P0171 code?
- Replacing the fuel pump.
- Replacing the fuel filter.
- Replacing the fuel pressure regulator.
- Replacing the powertrain control module.
- Replacing one or more injectors.
- Replacing one or more oxygen sensors.
- Replacing the mass air flow sensor.
- Repairing a vacuum leak.
What is a rich to lean sensor?
When this code is set it means that the Engine Control Module (ECM) has detected a problem with the amount of resistance in the heater circuit for the oxygen sensor on bank one of the engines.
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 is the p0139 code detected in the ECM?
When is the P0139 code detected? 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 does the p0171 code on an OBD2 mean?
P0171 OBD2 Trouble Code: System Too Lean (Bank 1) A P0171 code appears in the engine control unit when the Oxygen sensor on bank 1 recognizes a too lean air-fuel mixture for the sensor to correct it. Several different things could cause this trouble code. Here is what you need to know about the P0171 code.
When does the front O2 sensor Register p0171?
P0171 is triggered when the front O2 sensors recognize a lean mixture. It can both be a short-term lean mixture or a long-term lean mixture. If it’s a short-term lean mixture the fuel mixture is often very lean. If it’s a long-term mixture, it can register the code because of a small notice of lean mixture over time.