C0307 Diagnostic Trouble Code

C0307 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 C0307 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
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

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
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.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. 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 C0307 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 C0307.

Fortunately, C0307 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0307 Trouble Code For Specific Cars

C0307 Isdera Commendatore SCP (J1850) Invalid or Missing Data for Personalization (Memory) Features
C0307 Porsche Kremer Fuel Pump Secondary Circuit Low
C0307 Ferrari F430 Internal Control Module RAM Error
C0307 Citroen 10 Hp Fan Control Circuit Malfunction
C0307 Austin Metro Aux A/C Blower Motor Relay Circuit Short to Ground
C0307 Chrysler Plymouth EVR Control Circuit Malfunction
C0307 Lexus Lx TCU Unable To Control Desired Throttle Angle