Autonality.AI
Demo

OBD code P0174

Similar to P0171, but affecting bank 2 of the engine.

Estimated severity
Medium
Common symptoms
  • Similar to P0171: power loss, hesitation and possible unstable idle
  • Higher fuel consumption due to fuel-trim corrections
Likely causes
  • Vacuum leaks around bank 2
  • Dirty or low-flow injectors on bank 2
  • Dirty or out-of-range MAF sensor
  • General low fuel pressure
Recommended checks
  1. 1. Compare fuel trims between both banks, including STFT and LTFT.
  2. 2. Look for intake air leaks near bank 2.
  3. 3. Inspect and clean bank 2 injectors if needed.
  4. 4. Check fuel pressure and MAF operation.

What does code P0174 mean?

P0174 is the bank 2 equivalent of P0171. If P0171 and P0174 appear together, the cause is often shared, such as an intake leak, MAF issue or low fuel pressure. If only one bank is affected, focus on leaks, injectors or components on that side of the engine.

Try assisted diagnostics