U1959 Diagnostic Trouble Code

U1959 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 U1959 diagnostic trouble code may include:

Reduction in engine performance, especially at low RPM levels
Vacuum leak on the engine
Diminished fuel efficiency
Poor fuel economy

Possible Causes :

Faulty IMRC actuator/sensor
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Dirty air cleaner element Damaged DPF

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code U1959 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 U1959.

Fortunately, U1959 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1205 Trouble Code For Specific Cars

U1959 Nissan R390 Crankshaft Position Sensor A Circuit Malfunction
U1959 Nissan 300 Chime OUTPUT Request Ckt Short to Ground
U1959 Citroen C8 Fuel Delivery System Malfunction - Low
U1959 De Tomaso Longchamp Hydraulic Base Brake Failure
U1959 Porsche Boxster Fuel Pressure Regulator 1 Control Circuit
U1959 Lada 111 Servo Motor Potentiometer Vent Circuit Open
U1959 Yue Loong Feeling SCP (J1850) Invalid or Missing Data for Time / Date