AutoCodes - Bmw - P0173 BMW

P0173 BMW Code - Fuel Trim Malfunction Bank 2

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|P0173 BMW code 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

|How do I fix the P0173 BMW code?

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's pins.

|P0173 BMW code tech notes

Dirty air filter of faulty air flow sensor are common causes for the P0173 code of the problem.





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|Cost of diagnosing the P0173 BMW code

Labor: 1.0

The cost of diagnosing the P0173 BMW code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0173 BMW code detected?

- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is not correct

|What are P0173 BMW code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Excessive Fuel Consumption

|P0173 BMW code 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).
OBDII Code P0173 Bmw - Fuel Trim Malfunction Bank 2 - AutoCodes.com

|Need more information with the P0173 BMW code?

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|Need help with a P0173 BMW code?

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|P0173 BMW code comments

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Repair Importance Level: 3
 
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