DTC P0171 Acura
Rear Bank (Bank 1) Fuel System Too Lean
Rear Bank (Bank 1) Fuel System Too Lean
Description
If long term fuel trim is higher than normal (too lean), a malfunction in the fuel metering components is detected and a DTC is stored. Long term fuel trim is higher than 1.188 (+18.8 %). Engine is at running temperature, vehicle speed at 550-4,000 rpms and the system is in closed loop. NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot.
Cause and Solution
Vacuum leaks
Clogged fuel filter
Faulty fuel pump or regulator
Faulty MAF sensor IAT sensor
Faulty EVAP canister purge valve
Faulty Throttle body
Video Guide
Diagnostic Info
- DTC Code: P0171
- Brand: Acura