C0074 Diagnostic Trouble Code

C0074 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 C0074 diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
Diminished fuel efficiency

Possible Causes :

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.
Defective ECU strategies or components will prevent proper regeneration
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

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. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.

Process Tips

Diagnostic trouble code C0074 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 C0074.

Fortunately, C0074 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0074 Trouble Code For Specific Cars

C0074 Delage D Hydraulic Oil Temperature Sensor Circuit Intermittent
C0074 Awz-zwickau Trabant Aux Heater Overheat Sensor Circuit Short to Ground
C0074 Jaguar C-type Seat Driver Forward Circuit Open
C0074 Datsun 240 High Mount Stop Lamp Circuit Short to Battery
C0074 Morgan 42 F4 Booster Solenoid circuit Failure
C0074 Hispano Suiza Type 68 Pedal Demand Sensor B Circuit High Input
C0074 Turner 803 Pedal Position Sensor C Circuit High Input