System: Powertrain (P-Code)
SAE Standard (Generic)
Family: Fuel Trim General
Code P0170: Fuel Trim Bank 1
Diagnostic & Technical Explanation
Code P0170 (Fuel Trim Bank 1) sets when overall short- or long-term fuel trim for a bank moves outside its normal operating window without a specific lean or rich bias being isolated. Causes span vacuum leaks, a fuel delivery imbalance, or a fuel/air metering sensor reading incorrectly for that bank.
First-listed procedure
Rank #1
Inspect for vacuum leaks and check fuel trim data with a scan tool
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 2 procedure(s) are in the licensed dataset. Ordering context.
Full family: Fuel Trim General
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)