Code P0172
System Too Rich Bank 1
Plain English Meaning:Your engine is getting too much fuel
Yellow: Drive with Caution
Running rich can damage catalytic converter
P0172 Symptoms
- •Black smoke fuel smell poor MPG rough running
Most Common Causes of P0172
P0172 Repair Playbook
Required Mechanic Tests
A qualified shop should perform these tests before replacing any parts to ensure they aren't guessing:
O2 sensor readings fuel trim check injector test
Typical Fix Paths & Estimated Costs
Injector repair MAF cleaning $150–$800
Parts for P0172 Repair
Common replacement parts for fuel system codes. (Paid links)
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