P04BB Diagnostic Trouble Code

P04BB 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 P04BB diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
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)
Faulty IMRC actuator/sensor

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 P04BB 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 P04BB.

Fortunately, P04BB is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P04BB Trouble Code For Specific Cars

P04BB Austin A99 Autolamp On Circuit Short To Ground
P04BB Lotus 72 Torque Converter/Brake Switch B Circuit High
P04BB Packard Patrician Driver Door Handle Circuit Failure
P04BB Bmw 228 Camshaft Position Sensor Circuit Low Input
P04BB Renault Scenic 4 High Mount Stop Lamp Circuit Failure
P04BB Seat Mii Injector High Side Short To GND Or VBATT - Bank 2
P04BB Lancia Artena Speed Wheel Sensor LF Circuit Open