P168B Diagnostic Trouble Code

P168B 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 P168B diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
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)
Dirty air cleaner element Damaged DPF

Repair Processes :

If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. 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 P168B 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 P168B.

Fortunately, P168B is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P168B Trouble Code For Specific Cars

P168B Mercedes B 150 ABS Hydraulic Pressure Differential Switch Input Circuit Failure
P168B Paterson Model 33 Driver Side Satellite Communication Circuit Short to Ground
P168B Toyota Quantum Park Brake Switch # 2 Applied Circuit Failure
P168B Dodge Coronet Ignition Coil G Primary/Secondary Circuit Malfunction
P168B Bristol Blenheim Crankshaft Position Sensor A Circuit Malfunction
P168B Fiat 500 Lamp Air Bag Warning Indicator Circuit Open
P168B Citroen Berlingo Front Crash Sensor Driver Communications Fault