B3071 Diagnostic Trouble Code

B3071 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 B3071 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 :

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 you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

Process Tips

Diagnostic trouble code B3071 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 B3071.

Fortunately, B3071 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B3071 Trouble Code For Specific Cars

B3071 Chrysler Me Evaporative Emission Control System Purge Control Valve Circuit Open
B3071 Holden Ht Power Limit Shutdown Fault
B3071 Honda Ridgeline I Rear Washer Input Short to Ground
B3071 De Dietrich De Dietrich HO2S Heater Resistance (Bank 1 Sensor 1)
B3071 Warwick Buick SCP (J1850) Invalid or Missing Data for Memory Storage
B3071 Mercedes Cls 250 ABS Outlet Valve Coil Rear Circuit Short To Ground
B3071 Dkw-vemag Vemag-fissore Ignition Coil A Primary Circuit Malfunction