P131C Diagnostic Trouble Code

P131C 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 P131C diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. 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. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code P131C 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 P131C.

Fortunately, P131C is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P131C Trouble Code For Specific Cars

P131C Mazda Demio Transmission Transfer Case Shift Motor Open Circuit
P131C Mazda Cronos Transmission Transfer Case Disengaged Solenoid Open Circuit
P131C Nissan Zaroot Cylinder 1 Injector Circuit High
P131C Fiat 750 Lamp Dome Input Circuit Open
P131C Lancia Alpha Speed Wheel RF Input Signal Missing
P131C Citroen B2 Four Wheel Drive (4WD) Switch Circuit Range/Performance
P131C Ferrari 256 Input/Turbine Speed Sensor Circuit No Signal