P0839 Diagnostic Trouble Code

P0839 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a P0839 diagnostic trouble code may include:

Carbon Buildup on O2 Sensor
Malfunction Indicator Lamp (MIL) illuminated
Hesitation upon acceleration
Diminished fuel efficiency

Possible Causes :

Faulty IMRC actuator/sensor
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Some aftermarket accessories and performance modifications

Repair Processes :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code P0839 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0839.

Fortunately, P0839 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0839 Trouble Code For Specific Cars

P0839 Toyota Gt86 Oil Change Reset Button Circuit Short To Battery
P0839 Graham 26 Passenger Mirror Horizontal / Vertical Feedback Potentiometer Circuit Open
P0839 Steyr-puch 650 Lamp Turn Signal Left Circuit Failure
P0839 Toyota Caserta O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
P0839 Ferrari P5 Key Line Voltage
P0839 Stutz E4 Lateral Accelerometer circuit Failure
P0839 Sunbeam 12 MAF Sensor Out Of Self Test Range./KOER Not Able To Complete KOER Aborted