P198A Diagnostic Trouble Code

P198A 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 P198A diagnostic trouble code may include:

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
Faulty or damaged wiring
Hesitation upon acceleration
Diminished fuel efficiency

Possible Causes :

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.
Defective ECU strategies or components will prevent proper regeneration
Fuel with a large percentage of sulfur will clog the DPF quickly

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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code P198A 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 P198A.

Fortunately, P198A is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P198A Trouble Code For Specific Cars

P198A Bmw 3000 Catalyst Damage
P198A Peugeot 4007 EGR Metering Orifice Restricted
P198A Vauxhall Vectra B Pressure Control Solenoid C Performance or Stuck off
P198A Hillman Speed PATS Received Invalid Format Of Key-Code From Ignition Key Transponder
P198A Renault Zoom HO2S Heater Resistance (Bank 2 Sensor 1)
P198A Hyundai I40
P198A Piontek Sport-tech Evaporative Emission (EVAP) System Flow During Non-Purge Oldsmobile Only