B0291 Diagnostic Trouble Code

B0291 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 B0291 diagnostic trouble code may include:

Fuel pressure too high
Diminished fuel efficiency
Rich or lean exhaust
Lack of power

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
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. Look at the plug wires to make sure they are not burnt or laying on the exhaust. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code B0291 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 B0291.

Fortunately, B0291 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0291 Trouble Code For Specific Cars

B0291 Alfa Romeo 155 ABS Outlet Valve Coil RR Circuit Open
B0291 Franklin 11 Needle Lift Sensor Malfunction
B0291 Italdesign Machimoto SCP (J1850) Lack of Acknowledgment for Door Locks
B0291 Aston Martin Db2 Air Suspension RR Air Spring/Shock Solenoid Output Circuit Failure
B0291 Fiat Supermirafiori Left Front Center Sensor Circuit Fault
B0291 Ford F-250
B0291 Fiat Grande Lamp Tail Output Circuit Short To Ground