P1739 Diagnostic Trouble Code

P1739 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 P1739 diagnostic trouble code may include:

Reduction in engine performance, especially at low RPM levels
Vacuum leak on the engine
Diminished fuel efficiency
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.
Dirty air cleaner element Damaged DPF

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. 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.

Process Tips

Diagnostic trouble code P1739 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 P1739.

Fortunately, P1739 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1739 Trouble Code For Specific Cars

P1739 Rover 825 Ignition Coil D Primary/Secondary Circuit Malfunction
P1739 Peugeot 504 EIC Switch-2 Assembly Circuit Open
P1739 Jaguar Xka Seat Driver Rear Down Circuit Failure
P1739 Mitsubishi Mum Aux A/C Mode Position Reference Circuit Short to Ground
P1739 Mitsubishi Space Star Ii Aux Heater Overheat Fault
P1739 Oldsmobile Eighty-eight Cylinder 9 Injector Circuit High
P1739 Mercury Colony Air Suspension LR Air Compress Request Exceeded Max Timing