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 Fiat 1600 Lack Of HO2S12 Switch - Sensor Indicates Rich
P198A Mitsubishi Montero Aux A/C Mode Position Reference Circuit Short to Battery
P198A Chevrolet Cheyenne Driver Power Window Up Switch Circuit Failure
P198A Amc Rambler Air Suspension Gate Solenoid Output Circuit Short To Battery
P198A Reliant Se6 Gate Select Position Circuit High
P198A Renault Zo HO2S Heater Resistance (Bank 1 Sensor 2)
P198A Trident Venturer Passenger Solar Radiation Sensor Circuit Open