U0199 Diagnostic Trouble Code

U0199 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 U0199 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
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.
Faulty IMRC actuator/sensor

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs.

Process Tips

Diagnostic trouble code U0199 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 U0199.

Fortunately, U0199 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0199 Trouble Code For Specific Cars

U0199 Bugatti Type 50 Cylinder 12 Contribution/Balance Fault
U0199 Zagato Zeta SCP (J1850) Invalid or Missing Data for Transmission / Transaxle / PRNDL
U0199 Mazda Kabura Turbo Boost Pressure Not Detected
U0199 Vauxhall Insignia Pressure Control Solenoid A Control Circuit Low
U0199 Chery Qq DPFE Circuit Low Input
U0199 Ford 021 Left Rear Turn Lamp Circuit Failure
U0199 Nsu Tt Cylinder 12 Misfire Detected