Engine Error
P0170
Fuel Trim Malfunction (Bank 1)
Severity
High
Symptoms
Poor idle, engine hesitation, black smoke or lean stalling
Common Causes
- Massive vacuum leak
- Defective MAF sensor
- Failing O2 sensor
- Fuel pressure too high or too low
How to Fix
- 1 Smoke test for intake vacuum leaks
- 2 Clean or replace MAF sensor
- 3 Test and replace Bank 1 O2 sensor
- 4 Check fuel pump pressure
Estimated Repair Cost
USD
$80
–
$800
MAF sensor: 150 - 300; Fuel pump: 400 - 800