P1148 fault code: what it means

P1148: Closed loop fuel control not working on bank 1: the ECM cannot use the A/F sensor. Higher fuel use and emissions.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

A/F sensor 1 faulty
A/F sensor heater fault
wiring or connector fault

P1148 by make

Nissan

Closed loop fuel control not working on bank 1: the ECM cannot use the A/F sensor. Higher fuel use and emissions.

Usual causes: A/F sensor 1 faulty; A/F sensor heater fault; wiring or connector fault

What the repair usually costs

EV cabin PTC heater replaceNZ$1,140–NZ$3,140 · A$1,130–A$3,090

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Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.