P0B68 Diagnostic Trouble Code

P0B68 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 P0B68 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. 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 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 P0B68 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 P0B68.

Fortunately, P0B68 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0B68 Trouble Code For Specific Cars

P0B68 Frazer Nash Competition No Latch Signal Sensed on Closing and Door Reversed
P0B68 Morgan Plus 8 Brake Motor Warning lamp Circuit Failure
P0B68 Lexus Rx 300 TFT Sensor In Range Failure High
P0B68 Rolls-royce Silver Wraith Idle Air Control System At Adaptive Clip
P0B68 Audi 4000 All Doors Unlock Relay Circuit Failure
P0B68 Honda Crx Pressure Control Solenoid Stuck On
P0B68 Volvo 260 SCP (J1850) Invalid or Missing Data for Displays