P109F Diagnostic Trouble Code

P109F 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 P109F diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Engine surge

Possible Causes :

Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
An air leak forward of the DPF will change the sensor readings resulting in the code
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. Now, clear the codes and test-drive the vehicle to see if the code is reset. 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.

Process Tips

Diagnostic trouble code P109F 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 P109F.

Fortunately, P109F is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P109F Trouble Code For Specific Cars

P109F Volkswagen Touran Iii SCP (J1850) Invalid or Missing Data for Audio Control
P109F Woodill Wildfire
P109F Toyota Mega Cruiser Output Circuit Check Signal High
P109F Alfa Romeo 4c Accelerometer Front Circuit Failure
P109F Ford Trend Misfire Monitor AICE Chip Fault
P109F Ferrari California Interior Fan Control Circuit Short to Ground
P109F Moretti 1200 Battery Saver Relay Coil Circuit Short To Battery