U0104 Diagnostic Trouble Code

U0104 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 U0104 diagnostic trouble code may include:

Hesitation upon acceleration
Excessive exhaust leak
Rich or lean exhaust
Diminished fuel efficiency

Possible Causes :

The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Defective ECU strategies or components will prevent proper regeneration
Some aftermarket accessories and performance modifications

Repair Processes :

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 missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code U0104 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 U0104.

Fortunately, U0104 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0104 Trouble Code For Specific Cars

U0104 Holden Fe Power Cable For Power Sliding Door Broken
U0104 Renault Grand Scenic Glow Plug Circuit Low Input (Bank #1)
U0104 Thames 60 Module Supply Voltage Out Of Range
U0104 Mazda Activehicle Transmission Transfer Case Contact Plate Power Open Circuit
U0104 Mercedes-benz Sl Class Air Suspension Front Inflator Solenoid Output Circuit Open
U0104 Alfa Romeo 175 ABS Power Relay Coil Short Circuit To Ground
U0104 Facel Vega Excellence Injection Timing Control Circuit Malfunction