P2739 Diagnostic Trouble Code

P2739 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 P2739 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. 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.

Process Tips

Diagnostic trouble code P2739 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 P2739.

Fortunately, P2739 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P2739 Trouble Code For Specific Cars

P2739 Nissan Lucino Column Tilt Feedback Potentiometer Circuit Short to Battery
P2739 Knox Model O Servo Motor Potentiometer Airintake Right Circuit Short To Battery
P2739 Mercedes Sl 400 Air Bag Crash Sensor #2 Feed/Return Circuit Open
P2739 Simca Plein Ceil Intermediate Shaft Speed Sensor Circuit
P2739 Citroen Six Fuel Pump Secondary Circuit Low, High Speed
P2739 Venturi Atlantique Pump Speed Signal Fault
P2739 Cisitalia 1100 Exhaust Valve Control Solenoid Circuit (Bank 1)