P0172System Too Rich (Bank 1)
The computer detects excess fuel relative to air in bank 1.
Can I keep driving? With caution
You can drive to the shop, but do not postpone the repair. The problem may worsen and damage other components.
Sistema Afectado
Aire / Combustible · Inyección, MAF, MAP, O₂
Relacionado con la mezcla aire-combustible: sensores de flujo, presión, inyectores o bomba.
Espacio para vendedores de repuestos
Aún no hay un anunciante en este espacio.
Symptoms You Will Notice
What you may observe when this code appears
- Black smoke from the exhaust
- Strong fuel smell
- Excessive fuel consumption
- Sooty black spark plugs
Possible Causes
The components or conditions that trigger this code
- 1Injectors with internal leaks
- 2Faulty fuel pressure regulator
- 3Bad oxygen sensor
- 4Very dirty air filter
How to Fix It — Step by Step
Recommended diagnostic and repair procedure
- 1Test the injectors (drip test)
- 2Check the fuel pressure regulator
- 3Replace the O2 sensor if needed
- 4Replace the air filter
Note: This information is for general reference. For precise diagnostics and safety repairs, always consult a certified mechanic.
Estimated Cost
Approximate range in USD (varies by region and shop)
Sensors + injectors
* Diagnosis only: $50–$150
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