B1574 Diagnostic Trouble Code

B1574 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 B1574 diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Dirty air cleaner element Damaged DPF

Repair Processes :

Now, clear the codes and test-drive the vehicle to see if the code is reset. 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. 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 B1574 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 B1574.

Fortunately, B1574 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1574 Trouble Code For Specific Cars

B1574 Frazer Nash Continental No Movement Detected After an Unlatch During Power Open
B1574 Buick Special Damper LF Circuit Failure
B1574 Ferrari 159 Injector Control Pressure Not Detected During Crank
B1574 Panoz Esperante Driver Power Window Up Circuit Short To Ground
B1574 Bmw M Clutch Actuator Circuit Low
B1574 Nissan Xvl Cylinder #8 High To Low Side Short
B1574 Lancia Ardea Speed Wheel Sensor All Coherency Failure