The engine is "too rich" when the O2 sensors detect more fuel than air during combustion. Leaking fuel injectors (stuck open or damaged seals) and faulty Mass Air Flow (MAS) sensors are the most likely causes of this problem.
Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
The cost to diagnose the P2178 Dodge code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closer to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely small (The actual mixture ratio is too rich.), the ECM judges the condition as the fuel injection system malfunctions and lights up the MIL (2 trip detection logic).
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