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Powertrain fault code

P0173: Fuel Trim (Bank 2)

Fix soon

Usually drivable, but have it checked soon.

What P0173 means

The fuel mix correction is outside its normal range.

Common causes

  • Air leaks
  • Fuel delivery problems
  • Dirty MAF sensor

What to check first

  1. Scan for other codes stored at the same time.
  2. Check the fuel trim numbers on a live scan.

Get P0173 explained for your car: $2.99

  • P0173 explained in full for your make and model: meaning, how urgent, likely causes and what to check, in order.
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  • Your own private report page you can save as a PDF or show your mechanic.

Read your car's codes yourself, free

Plug a cheap ELM327 OBD-II adapter into the port under the dashboard and open the scan tool: Chrome or Edge on a computer with a USB adapter, or Chrome on Android with a Bluetooth LE adapter. It reads and clears codes and shows emissions readiness. It does not work on iPhone.

Open the free scan tool

Need help with P0173?

Tell us your car and what it is doing with P0173. We reply by email with what to check first, in plain words. Free.

Related codes

P0170

General guidance only, not a diagnosis. A qualified mechanic should confirm the cause before you replace parts.