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P0173 - Fuel Trim Malfunction Bank 2

Possible causes
- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
What does this mean? What does this mean?
Tech notes
Dirty air filter of faulty air flow sensor are common causes for the P0173 code of the problem.
What does this mean? What does this mean?
When is the code detected?
- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is not correct
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
P0173 Description

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely 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 large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).

P0173 Information for specific makes
P0173 BMW Fuel Trim Malfunction Bank 2
P0173 CHRYSLER Fuel System 2/1 Rich Control Over Limit
P0173 DODGE Fuel System 2/1 Rich Control Over Limit
P0173 HYUNDAI Fuel Trim Bank 2
P0173 JEEP Fuel System 2/1 Rich Control Over Limit
P0173 KIA Fuel Trim Bank 2
P0173 MAZDA Bank 2 Adaptive Fuel Table At Calibrated Limit
P0173 MERCEDES-BENZ Fuel Trim Malfunction Bank 2
P0173 MITSUBISHI Fuel Trim Malfunction Bank 2
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