P0172
System Too Rich Bank 1
P0172 is an OBD-II diagnostic trouble code meaning: System Too Rich Bank 1. Common causes: dmrv malfunction, fuel leak in injectors. Estimated repair cost: $56–167.
Symptoms
- Increased fuel consumption
- Black smoke from the exhaust pipe
- Reduced engine power
- Unstable idling
Causes
- DMRV malfunction
- Fuel leak in injectors
- Dirty or faulty spark plugs
- Oxygen sensor malfunction
- Problems with the EVAP system
- Air filter clogged
How to Fix
- Check the air flow sensor for contamination or malfunction
- Diagnose injectors for leaks
- Check spark plugs
- Check oxygen sensor
- Inspect the EVAP system for leaks
- Replace the air filter if necessary
Related codes
Error P0172 by Vehicle Brand
FAQ
What does the P0172 code mean?
P0172 is an OBD-II diagnostic trouble code that indicates: System Too Rich Bank 1
What causes a P0172 error code?
The most common causes of P0172 include: DMRV malfunction; Fuel leak in injectors; Dirty or faulty spark plugs; Oxygen sensor malfunction.
How do I fix a P0172 diagnostic trouble code?
To fix P0172: Check the air flow sensor for contamination or malfunction. Diagnose injectors for leaks. Check spark plugs. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0172?
Limited driving only, diagnose soon
How much does it cost to fix P0172?
The estimated repair cost for P0172 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat