B1951 Diagnostic Trouble Code

B1951 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 B1951 diagnostic trouble code may include:

Fuel pressure too high
Diminished fuel efficiency
Rich or lean exhaust
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 :

A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Faulty IMRC actuator/sensor
Faulty IMRC actuator relay (if equipped)

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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code B1951 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 B1951.

Fortunately, B1951 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1951 Trouble Code For Specific Cars

B1951 Renault Logan Hazard Flash Output Circuit Short To Ground
B1951 Honda Concerto Pressure Control Solenoid Intermittent
B1951 Talbot Alpine Mirror Passenger Horizontal Feedback Potentiometer Circuit Short to Ground
B1951 Bentley Arnage Battery Power Relay Circuit Short To Ground
B1951 Mercedes-benz Cl Class Air Pressure Low Circuit Short to Gnd
B1951 Moretti 750 Battery Voltage Low
B1951 Chevrolet Sail EIC Switch-2 Assembly Circuit Short To Battery