The P2194 code indicates that the engine control module has detected a rich air-fuel mixture on Bank 2 specifically during high-load operating conditions. This means there is either too much fuel being delivered or too little air entering the cylinders on that side of the engine.
A fuel injector on Bank 2 may be stuck open or leaking, introducing excess fuel into the combustion chamber.
The upstream O2 sensor on Bank 2 may be skewed or failing, incorrectly reporting a rich condition to the computer.
An incorrect fuel pressure delivery can cause injectors to spray more fuel than intended.
A purge valve stuck open can allow excess fuel vapors from the charcoal canister to enter the intake manifold.
A severely clogged air filter or obstruction in the intake tract can reduce air volume, leading to a rich condition.
Internal failure of the engine control module or corrupted tuning data may cause incorrect fuel mapping.
Certain faults, such as a slightly leaking injector, may not be significant enough to trigger a code at idle but become apparent when the engine demands more air and fuel during acceleration.
Yes, if the air filter is heavily restricted, the engine cannot draw in enough air, which shifts the air-fuel ratio toward a rich condition.
No. It is very rare for the PCM to be the cause of P2194; it is almost always a mechanical fuel leak or a faulty sensor. The PCM should only be considered after all sensors and fuel components are verified.