P1959 Diagnostic Trouble Code

P1959 is a kind of OBD-II Diagnostic P-Powertrain 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 P1959 diagnostic trouble code may include:

Fuel pressure too high
Diminished fuel efficiency
Rich or lean exhaust
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Faulty IMRC actuator relay (if equipped)

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve.

Process Tips

Diagnostic trouble code P1959 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 P1959.

Fortunately, P1959 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

P1959 Fiat 133 Knock Sensor 2 Circuit Range/Performance (Bank )
P1959 Volkswagen New Beetle Right Rear Sensor Circuit Failure
P1959 Moretti 2500 Battery Voltage Circuit Malfunction
P1959 Aston Martin Ulster Air Suspension Vent Solenoid Output Circuit Short To Ground
P1959 Toyota Proace Park Brake Actuator Assembly Switch Released Circuit Short to Gnd
P1959 Kia Retona Secondary Air Injection System Incorrect Flow Detected
P1959 Chrysler Centura Engine Position System Performance (Bank1)