B0091 Diagnostic Trouble Code


B0091 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 B0091 diagnostic trouble code may include:
  • Poor fuel economy
  • Possible spark knock (detonation / pre-ignition)
  • Misfire
  • Diminished fuel efficiency
Place of B0091 in engine

Possible Causes :

  • Faulty IMRC actuator/sensor
  • A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
  • A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

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. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code B0091 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 B0091.

Fortunately, B0091 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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