B157E Diagnostic Trouble Code

B157E 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 B157E diagnostic trouble code may include:

Engine surge
Blown fuse (if applicable)
Lack of power
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)
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. 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. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code B157E 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 B157E.

Fortunately, B157E is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B157E Trouble Code For Specific Cars

B157E Rinspeed Advantige Hydraulic Oil Temperature Sensor Circuit Intermittent
B157E Mazda Ms-8 A/C Post Heater Sensor #2 Circuit Failure
B157E Toyota Hilux Oil Level Lamp Circuit Open
B157E Fiat 850 Lamp Dome Input Circuit Short To Ground
B157E Nissan 1600 Child Seat Detection Circuit Short To Battery
B157E Chevrolet Equinox Drivers Seat Belt Buckle Switch Circuit Short to Ground
B157E Chrysler Laser Evaporative Emission Control System Pressure Sensor Low Input