B0657 Diagnostic Trouble Code

B0657 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 B0657 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
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 :

A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Faulty IMRC actuator/sensor
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code B0657 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 B0657.

Fortunately, B0657 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0657 Trouble Code For Specific Cars

B0657 Berkeley Twosome Brake Fluid Level Sensor Input Short Circuit To Battery
B0657 Suzuki Ignis Microphone Input Signal Circuit Open
B0657 Fiat 1500
B0657 Mercedes C 270 ABS Inlet Valve Coil LF Circuit Short To Ground
B0657 Pininfarina Coupe Engine Speed Input Circuit Range/Performance
B0657 Lincoln Continental Throttle Position Not Available
B0657 Mercedes S 600 Air Bag Crash Sensor #1 Feed/Return Circuit Failure