P0173Toyota C-hrYears: 1996 - 2026
Fuel Trim Malfunction (Bank 2)
Reviewed by ASE Certified Technician
What does this mean?
Code P0173 indicates a general fuel trim malfunction on Bank 2. The PCM cannot maintain the proper air-fuel ratio.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Toyota C-hr models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Vacuum leak in intake system
Dirty or contaminated MAF sensor
Clogged or faulty fuel injector
Faulty oxygen (O2) sensor
Faulty fuel pressure regulator
Symptoms to Watch For
- Check Engine Light is illuminated
- Rough or unstable idle
- Decreased fuel economy
- Hesitation or stumble during acceleration