P1668 Diagnostic Trouble Code

P1668 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 P1668 diagnostic trouble code may include:

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

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

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. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications.

Process Tips

Diagnostic trouble code P1668 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 P1668.

Fortunately, P1668 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1668 Trouble Code For Specific Cars

P1668 Talbot Sunbeam Mirror Passenger Right Circuit Failure
P1668 Mercedes Sprinter Air Bag Driver Circuit Open - Loop #2
P1668 Dodge Caravan Ignition Coil C Primary/Secondary Circuit Malfunction
P1668 Piontek Sport-tech Evaporative Emission (EVAP) System Flow During Non-Purge Oldsmobile Only
P1668 Abarth Grande Punto A/C Clutch Magnetic Control Circuit Failure
P1668 Daihatsu U4 GPS Antenna Open Circuit
P1668 Pontiac Piranha Fan Secondary Low with Low Fan On