P086E Diagnostic Trouble Code

P086E 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 P086E diagnostic trouble code may include:

Faulty or damaged wiring
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Poor fuel economy
Reduction in engine performance, especially at low RPM levels

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

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 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. 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 P086E 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 P086E.

Fortunately, P086E is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P086E Trouble Code For Specific Cars

P086E Lamborghini Countach Shift Time Error
P086E Auto-union 1000 Aux Heater Fuel Pump Circuit Open
P086E Chevrolet Metro EGI Glow Plug Secondary Failure
P086E Mazda Clef Transmission Transfer Case Differential Lock-Up Solenoid Short Circuit To Ground
P086E Pontiac 28 Exhaust Not Warm, Downstream O2 Sensor
P086E Mazda 3 Transmission Transfer Case Contact Plate 'B' Short Circuit To Ground
P086E Skoda Superb Ii Lack Of HO2S21 Switch - Sensor Indicates Lean