P2679 Diagnostic Trouble Code

P2679 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 P2679 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 :

Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code P2679 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 P2679.

Fortunately, P2679 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P2679 Trouble Code For Specific Cars

P2679 Darracq 3-litre Heated Catalyst Efficiency Below Threshold (Bank 2)
P2679 Facel Vega Facel Injector Circuit / IDM Codes Detected
P2679 Renault Megan Heated Backlite Input Circuit Failure
P2679 Honda N Iii PWM Input Circuit Failure
P2679 Iveco Daily Seat Direction Switch Assembly Circuit Failure
P2679 Nissan 1400 Child Seat Detection Circuit Open
P2679 Mercury Zephyr Air Suspension RF Air Spring Solenoid Output Circuit Open