U0125 Diagnostic Trouble Code

U0125 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 U0125 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
Diminished fuel efficiency

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Fuel with a large percentage of sulfur will clog the DPF quickly

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. 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. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code U0125 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 U0125.

Fortunately, U0125 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0125 Trouble Code For Specific Cars

U0125 Suzuki X90 Mirror Driver Vertical Feedback Potentiometer Circuit Short to Ground
U0125 Lexus Rx400h TFT Sensor In Range Failure Low Value
U0125 Suzuki Reno Mirror Driver Horizontal Switch Circuit Open
U0125 Citroen Gsx Fuel Pressure Regulator 1 Control Circuit High
U0125 Lincoln Mark Throttle Position Sensor In Range But Higher Than Expected
U0125 Holden Fx Power Door Lock Circuit Short To Battery
U0125 Opel Astra K Decklid Ajar Rear Door Circuit Open