P266D Diagnostic Trouble Code

P266D 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 P266D diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
Diminished fuel efficiency

Possible Causes :

Some aftermarket accessories and performance modifications
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

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 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.

Process Tips

Diagnostic trouble code P266D 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 P266D.

Fortunately, P266D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P266D Trouble Code For Specific Cars

P266D Mitsubishi Rpm Aux Heater Flame Sensor Circuit Open
P266D Frisky Friskysport NVM TIC Failure
P266D Citroen Pluriel Fuel Pump Secondary Circuit High
P266D Chrysler Avenger Engine Over Speed Condition
P266D Skoda 105 IP Power Sliding Door Open/Close switch Ckt Short to Gnd
P266D Aston Martin Mark Ii Air Suspension Vent Solenoid Output Circuit Failure
P266D Jaguar Xj-s Seat Driver Occupied Switch Circuit Failure