Engine Error
P0172
System Too Rich (Bank 1)
Severity
Medium
Symptoms
Black smoke from exhaust, strong gas smell, engine stalling
Common Causes
- Leaking fuel injector
- Faulty fuel pressure regulator
- Restricted air intake
- Bad MAF sensor
How to Fix
- 1 Test fuel pressure
- 2 Inspect and clean fuel injectors
- 3 Replace air filter
- 4 Test and replace MAF sensor
Estimated Repair Cost
USD
$100
–
$800
Injector replacement: $200 - $600; Regulator: $150