P0799 Diagnostic Trouble Code

P0799 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 P0799 diagnostic trouble code may include:

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

Repair Processes :

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. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code P0799 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 P0799.

Fortunately, P0799 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0799 Trouble Code For Specific Cars

P0799 Subaru Forester 2 Left Front Wheel Pressure Reduction Performance Problem
P0799 Maybach W3 Transmission Transfer Case Clockwise Shift Relay Coil Open Circuit
P0799 Marcos Mantis Transmission 4-Wheel Drive Clutch Relay Open Circuit
P0799 Porsche 936 Fuel Level Output Circuit Malfunction
P0799 Lada Natacha Shift Solenoid B Electrical/2-3 Shift Solenoid Circuit Electrical
P0799 Nissan Leaf Column Reach Feedback Potentiometer Circuit Short to Battery
P0799 Volkswagen Cabriolet Remote Keyless Entry Out of Synchronization