B0308 Diagnostic Trouble Code

B0308 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 B0308 diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
Reduction in engine performance, especially at low RPM levels

Possible Causes :

A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Some aftermarket accessories and performance modifications
Faulty IMRC actuator relay (if equipped)

Repair Processes :

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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. 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.

Process Tips

Diagnostic trouble code B0308 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 B0308.

Fortunately, B0308 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0308 Trouble Code For Specific Cars

B0308 Lotus Super Traction Control of Engine Exceeds Time-Out
B0308 Triumph Triple Speed Pedal Correlation PDS2 and LPDS Low
B0308 Fiat Ulysse Left Front Vertical Accelerometer Circuit Failure
B0308 Gaz M-21 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
B0308 Bertone Stratos Brake Pedal Input Circuit Failure
B0308 Hudson Jet Right Front Center Sensor Circuit Short to Vbat
B0308 Chevrolet Opala EGR No Flow Detected