P0173
Fuel Trim Bank 2
P0173 is an OBD-II diagnostic trouble code meaning: Fuel Trim Bank 2. Common causes: dirty/defective fuel injectors, vacuum leaks in bank 2. Estimated repair cost: $22–167.
Symptoms
- Increased fuel consumption
- Unstable idle
- Reduced engine power
- Smell of gasoline from the exhaust pipe
Causes
- Dirty/defective fuel injectors
- Vacuum leaks in bank 2
- Malfunction of the mass air flow sensor (MAF)
- Problems with oxygen sensors
- Dirty air filter
- Malfunction of the fuel pump or pressure regulator
- Leaks in the intake system
How to Fix
- Check the system for vacuum leaks (especially bank 2)
- Clean or replace the mass air flow sensor
- Check oxygen sensor readings
- Clean or replace fuel injectors
- Check fuel pressure and pump performance
- Clean throttle body
Related codes
Error P0173 by Vehicle Brand
FAQ
What does the P0173 code mean?
P0173 is an OBD-II diagnostic trouble code that indicates: Fuel Trim Bank 2
What causes a P0173 error code?
The most common causes of P0173 include: Dirty/defective fuel injectors; Vacuum leaks in bank 2; Malfunction of the mass air flow sensor (MAF); Problems with oxygen sensors.
How do I fix a P0173 diagnostic trouble code?
To fix P0173: Check the system for vacuum leaks (especially bank 2). Clean or replace the mass air flow sensor. Check oxygen sensor readings. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0173?
Limited driving only, diagnose soon
How much does it cost to fix P0173?
The estimated repair cost for P0173 is $22–167. Actual cost depends on your vehicle, location, and labor rates.
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