B1084 Diagnostic Trouble Code

B1084 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 B1084 diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
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
Rich or lean exhaust

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
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

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

Process Tips

Diagnostic trouble code B1084 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 B1084.

Fortunately, B1084 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1084 Trouble Code For Specific Cars

B1084 Volkswagen Golf 1 Ride Control RR Shock Actuator Circuit Failure
B1084 Skoda Superb Lack Of HO2S12 Switch - Sensor Indicates Rich
B1084 Mercedes C 220 ABS Hydraulic Valve Circuit Failure
B1084 Honda Jazz Pump Rotor Control Underfueling
B1084 Monteverdi 400 Battery Power Relay Circuit Open
B1084 Nissan Juke Coast Clutch Solenoid Inductive Signature Malfunction
B1084 Mini One ASM Mode Circuit High