B279F Diagnostic Trouble Code

B279F 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 B279F diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
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.
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. 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 B279F 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 B279F.

Fortunately, B279F is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B279F Trouble Code For Specific Cars

B279F Renault R5 Heated Wind Shield Relay Short to Vbatt (changed from Failure 2/6/97)
B279F Gmc Envoy Park Brake Actuator Assembly Switch Circuit Failure
B279F Opel Lotus Door Ajar Circuit Failure
B279F Abarth 850 A Camshaft Position Actuator Circuit (Bank 2)
B279F Lancia Prisma SSD Inductive Signature Malfunction
B279F Nissan Terrano Ii Cylinder #2 High To Low Side Open
B279F Lada 1200 SGC (Cam Position) Sensor Circuit Malfunction/ Crankshaft Position - Camshaft Position Correlation