P1B7B Diagnostic Trouble Code

P1B7B is a kind of OBD-II Diagnostic P-Powertrain 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 P1B7B diagnostic trouble code may include:

Carbon Buildup on O2 Sensor
Malfunction Indicator Lamp (MIL) illuminated
Hesitation upon 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
Some aftermarket accessories and performance modifications

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. Now, clear the codes and test-drive the vehicle to see if the code is reset. 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 P1B7B 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 P1B7B.

Fortunately, P1B7B is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1B7B Trouble Code For Specific Cars

P1B7B Maserati 151 Transmission Automatic 4-Wheel Drive Indicator (Lamp) Circuit Short To Battery
P1B7B Packard Mayfair Driver Door Ajar Circuit Short To Ground
P1B7B Ferrari 340 Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage
P1B7B Vauxhall Vectra Pressure Control Solenoid C Intermittent
P1B7B Fiat 16 Hp Lack Of HO2S Switch - Sensor Indicates Rich
P1B7B Renault Re Heated Windshield Relay Coil Circuit Failure
P1B7B Nissan Patrol Cooling Fan 1 Control Circuit Malfunction