U0073 Diagnostic Trouble Code

U0073 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 U0073 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. 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. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.

Process Tips

Diagnostic trouble code U0073 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 U0073.

Fortunately, U0073 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0073 Trouble Code For Specific Cars

U0073 Fiat 131 Knock Sensor 2 Circuit Low Input (Bank 2)
U0073 Suzuki Hustler MIL O/P Circuit Malfunction
U0073 Mercedes E 430 Accelerometer Front Circuit Failure
U0073 Autovia V8 Aux Heater Glow Plug Circuit Open
U0073 Daihatsu Materia Gear Shift Reverse Actuator Circuit Range/Performance
U0073 Maserati Auge Transmission Fluid Pressure Sensor/Switch B Circuit Low
U0073 Renault Thalia HO2S Heater Control Circuit (Bank 2 Sensor 2)