B1678 Diagnostic Trouble Code

B1678 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 B1678 diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
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
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. 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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code B1678 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 B1678.

Fortunately, B1678 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1678 Trouble Code For Specific Cars

B1678 Armstrong Siddeley 25 Air Suspension LR Vent Request Exceeded Max Timing
B1678 Ferrari Enzo Interior Scanning Sensor Circuit Failure
B1678 Skoda 450 Keyless Entry Circuit Short To Ground
B1678 Mg Tc All Door Lock Input Short to Ground
B1678 Singer Sm Invalid /fault data received (Non SCP)
B1678 Opel Speedster Door Driver Set Switch Stuck Failure
B1678 Fitch Phoenix Left Rear Sensor Circuit Failure