C0308 Diagnostic Trouble Code

C0308 is a kind of OBD-II Diagnostic C-Chassis 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 C0308 diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
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 :

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. 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 C0308 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 C0308.

Fortunately, C0308 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0308 Trouble Code For Specific Cars

C0308 Toyota Es3 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
C0308 Vauxhall Victor Pressure Control Solenoid Malfunction
C0308 Buick 80 Cylinder 4 Misfire Detected
C0308 Mercedes Slr Mclaren Air Bag Driver Circuit Open
C0308 Maserati Kyalami Transmission Fluid Pressure Sensor/Switch E Circuit Range/Performance
C0308 Citroen Xantia Fuel Rail Pressure Sensor Circuit Low Input
C0308 Gaz M-21 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)