U0333 Diagnostic Trouble Code

U0333 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 U0333 diagnostic trouble code may include:

Lack of power
Faulty O2 Sensor
Poor acceleration
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.
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

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. 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 U0333 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 U0333.

Fortunately, U0333 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0333 Trouble Code For Specific Cars

U0333 Bentley 4-litre Battery Power Relay Circuit Failure
U0333 Paykan High Line Driver Window Up / Down Power Circuit Short to Ground
U0333 Porsche Boxster Type 986 Fuel Pressure Regulator 1 Control Circuit Low
U0333 Daimler 4.5-litre Hazard Flash Output Circuit Short To Ground
U0333 Maserati Merak Transmission Fluid Pressure Sensor/Switch F Circuit Intermittent
U0333 Proton Inspira Fuel Shut Off Solenoid Malfunction
U0333 Awz-zwickau Trabant Aux Heater Overheat Sensor Circuit Short to Ground