P140F Diagnostic Trouble Code

P140F 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 P140F diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
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
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Defective ECU strategies or components will prevent proper regeneration

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. Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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 P140F 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 P140F.

Fortunately, P140F is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P140F Trouble Code For Specific Cars

P140F Renault Altica Gear Shift Forward Actuator Circuit / Open [forward motion, odd gears, 1,3,5]
P140F Warwick Buick SCP (J1850) Invalid or Missing Data for Memory Storage
P140F Hyundai Tiburon
P140F Bmw 8 Climate Control A/C Pressure Switch Circuit Short To Ground
P140F Chrysler Pt Touring Excessive Injection Control Pressure
P140F Simca Aronde Interior Fan Control Circuit Open
P140F Westfield Xtr SCP (J1850) Invalid or Missing Data for Navigation