B2891 Diagnostic Trouble Code

B2891 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 B2891 diagnostic trouble code may include:

Vacuum leak on the engine
Reduction in engine performance, especially at low RPM levels
Engine surge
Hesitation upon acceleration

Possible Causes :

A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Dirty air cleaner element Damaged DPF
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code B2891 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 B2891.

Fortunately, B2891 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2891 Trouble Code For Specific Cars

B2891 Riley Sprite Hydraulic Fluid Pressure/ Flow Circuit Short to Vbatt
B2891 Ford Limited Mirror Driver Switch Assembly Circuit Short To Ground
B2891 Mclaren M A/C Refrigerant Temperature Circuit High
B2891 Qvale Mangusta Fuel Temperature Sensor #2 Circuit Short to Battery
B2891 Honda S-mx RESCU/VEMS Input Circuit Open
B2891 Ford E-250 Manifold Absolute Temperature Circuit High Input
B2891 Oldsmobile F-85 Cylinder 9 Injector Circuit Low