B0879 Diagnostic Trouble Code

B0879 is a kind of OBD-II Diagnostic B-Body 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 B0879 diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
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.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code B0879 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 B0879.

Fortunately, B0879 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0879 Trouble Code For Specific Cars

B0879 Mg C-type Air Suspension RR Air Spring/Shock Solenoid Output Circuit Open
B0879 Nissan Armada Climate Control Air Temperature Internal Sensor Motor Circuit Failure
B0879 Toyota Avanza O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
B0879 Eagle Vision Incorrect Module Design Level
B0879 Marcos Gts Transfer Case unable to transition between 2H and 4H
B0879 Lada Riva Shift Solenoid B Performance or Stuck Off/2-3 Shift Solenoid Valve Performance
B0879 Bucciali Tav Cylinder #1 High To Low Side Open