U0279 Diagnostic Trouble Code

U0279 is a kind of OBD-II Diagnostic U-Network 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 U0279 diagnostic trouble code may include:

Lack of power
Faulty O2 Sensor
Poor acceleration
Hesitation upon acceleration

Possible Causes :

Some aftermarket accessories and performance modifications
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

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. 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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code U0279 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 U0279.

Fortunately, U0279 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0279 Trouble Code For Specific Cars

U0279 Seat 124 Injector Circuit Malfunction - Cylinder 10
U0279 Ford Megastar Mirror Driver Vertical Feedback Potentiometer Circuit Open
U0279 Suzuki Works Mirror Driver Vertical Feedback Potentiometer Circuit Open
U0279 Mercedes 122f 16hp A/C Temperature Sensor Out of Range
U0279 Rover 800 Ignition Coil D Primary Circuit Malfunction
U0279 Peugeot Nautilus Engine Coolant Sensor intermittent/ECT Sensor Intermittent
U0279 Ford Festiva Metering Oil Pump Temperature Sensor Circuit Malfunction