P22A9 Diagnostic Trouble Code

P22A9 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 P22A9 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
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
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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. 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 P22A9 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 P22A9.

Fortunately, P22A9 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P22A9 Trouble Code For Specific Cars

P22A9 Lancia Zeta Steering Column Lock Switch Circuit Failure
P22A9 De Dion Bouton 18 HO2S Heater Resistance (Bank 1 Sensor 3)
P22A9 Talbot 1510 Mirror Passenger Drive Circuit Failure
P22A9 Abarth 124 Spider 1-4 Upshift (Skip Shift) Solenoid Control Circuit Malfunction
P22A9 De Soto Diplomat Hood Switch Circuit Open
P22A9 Mazda Rx-01 5-6 Shift
P22A9 Mazda Atenza Transmission Transfer Case Contact Plate Power Short To Battery