B2122 Diagnostic Trouble Code

B2122 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 B2122 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

Possible Causes :

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.
Defective ECU strategies or components will prevent proper regeneration
An air leak forward of the DPF will change the sensor readings resulting in the code

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. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code B2122 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 B2122.

Fortunately, B2122 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2122 Trouble Code For Specific Cars

B2122 Holden Ek PNP Switch Out Of Self Test Range
B2122 Buick Centurion Cylinder 6 Injector Circuit High
B2122 Rolls-royce Silver Wraith Idle Air Control System At Adaptive Clip
B2122 Armstrong Siddeley 17 Air Suspension LR Height Sensor Circuit Open
B2122 Datsun 14 Heater System Failure
B2122 Ferrari 408 Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic
B2122 Mazda 110 Transmission Transfer Case Contact Plate 'A' Open Circuit