B19A9 Diagnostic Trouble Code

B19A9 is a kind of OBD-II Diagnostic B-Body 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 B19A9 diagnostic trouble code may include:

If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Corroded or damaged connector
Reduction in engine performance, especially at low RPM levels
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

Possible Causes :

A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Faulty IMRC actuator/sensor
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. 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 B19A9 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 B19A9.

Fortunately, B19A9 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B19A9 Trouble Code For Specific Cars

B19A9 Peugeot 206 ECU ROM Checksum Error
B19A9 Toyota Etios O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 3)
B19A9 Suzuki Sj Mirror Driver Memory Position Error
B19A9 Zastava 2101
B19A9 Sunbeam Venezia Mass or Volume Air flow Circuit High Input
B19A9 Audi R8 ASM Control Circuit Low
B19A9 Knox Model O Servo Motor Potentiometer Airintake Right Circuit Short To Battery