P0170

Fuel Trim (Bank 1)

Q: What does fault code P0170 mean?

Fuel Trim (Bank 1). General fuel trim malfunction on bank 1 — the ECM is having to add or subtract more fuel than it should to keep the mixture correct.

Q: What are the symptoms of P0170?

CEL; Rough idle; Poor fuel economy; Possible hesitation

Q: What are the possible causes of P0170?

Vacuum leak; Failing O2 sensor; Fuel pressure issue; Dirty MAF/injectors

Q: How to fix P0170?

Diagnose using live fuel trim data; Check for vacuum leaks; Inspect MAF and injectors; Test fuel pressure

Severity: Medium Fuel & Air Metering Generic OBD-II Code Est. Repair: $100 - $400

Schedule diagnosis soon. Continued driving may worsen the issue.

Quick Answer

P0170 means “Fuel Trim (Bank 1).” Severity: Medium. Estimated repair cost: $100 - $400. Most common sign: CEL.

What Does P0170 Mean?

General fuel trim malfunction on bank 1 — the ECM is having to add or subtract more fuel than it should to keep the mixture correct.

Common Symptoms

CEL

Rough idle

Poor fuel economy

Possible hesitation

Possible Causes

Vacuum leak

Failing O2 sensor

Fuel pressure issue

Dirty MAF/injectors

How to Fix P0170 – Repair Guide

Diagnose using live fuel trim data

Check for vacuum leaks

Inspect MAF and injectors

Test fuel pressure

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Budgeting for This Repair?

A typical P0170 repair runs about $100 - $400. If you'd rather spread the cost over time, estimate the payment with our free sister tool: Car Finance Calculator (50-state sales tax, trade-in equity, full amortization).

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.