B0957 Diagnostic Trouble Code

B0957 is a kind of OBD-II Diagnostic B-Body 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 B0957 diagnostic trouble code may include:

Engine surge
Blown fuse (if applicable)
Lack of power
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
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.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. 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. 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.

Process Tips

Diagnostic trouble code B0957 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 B0957.

Fortunately, B0957 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0957 Trouble Code For Specific Cars

B0957 Daimler De Headlamp Mode Select Circuit Failure
B0957 Isuzu Unicab
B0957 Proton 400 Fuel Select Switch Malfunction
B0957 Talbot Saoutchik Mirror Passenger Left Circuit Short To Battery
B0957 Graham Streak Passenger Power Window Motor Circuit Open
B0957 Ford Svt Mirror Passenger Up/Down Motor Stalled
B0957 Maserati Kyalami Transmission Fluid Pressure Sensor/Switch E Circuit Range/Performance