U0002 Diagnostic Trouble Code

U0002 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 U0002 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
Reduction in engine performance, especially at low RPM levels

Possible Causes :

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.
Some aftermarket accessories and performance modifications
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

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. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. 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 U0002 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 U0002.

Fortunately, U0002 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0002 Trouble Code For Specific Cars

U0002 Yue Loong Yln
U0002 Fbs Census Injector Circuit Open / Shorted - Cylinder #4
U0002 Ford Corcel MAF Sensor Intermittent/ Check of all OBDII Systems Not Complete
U0002 Holden Lc Power Steering Pressure sensor Circuit Intermittent
U0002 Triumph Daytona Passenger's Seat Recline Back Switch Circuit Short to Battery
U0002 Volvo 244 SCP (J1850) Invalid or Missing Data for Digital Signal Processing
U0002 Panhard Junior Driver Power Window One Touch Window Relay Circuit Open