Volvo S40 (1996–2004) – Electronic Fuel Injection (EFI) fault codes

14 fault codes

The same fault code can mean different things depending on model year and engine. Each meaning is therefore shown on its own row, with exactly which cars it applies to.

Code	Meaning	Applies to
EFI-0011	Heated oxygen sensor (HO2S). Faulty signal1998	1998
EFI-0011	Lambda probe. Signal faulty1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only
EFI-0012	Volume air flow (VAF) sensor1998	1998
EFI-0012	Volume air flow (VAF) sensor. Faulty signal1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only
EFI-0013	Intake air temperature (IAT) sensor. Faulty signal1998	1998
EFI-0013	Intake air temperature (IAT) sensor. Faulty signal1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only
EFI-0014	Throttle position (TP) sensor. Faulty signal1998	1998
EFI-0014	Throttle position sensor. Signal faulty1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only
EFI-0021	Engine coolant temperature (ECT) sensor. Faulty signal1998	1998
EFI-0021	Engine temperature sensor. Signal faulty1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only
EFI-0022	Engine speed (RPM) sensor1998	1998
EFI-0022	Impulse sensor. Signal missing1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only
EFI-0025	Atmospheric pressure sensor. Faulty signal1998	1998
EFI-0025	Atmospheric pressure sensor. Signal faulty1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only
EFI-0036	Ignition adjustment signal. Faulty signal1998	1998
EFI-0036	Ignition adjustment signal. Signal faulty1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only
EFI-0041	Injector; Faulty signal1998	1998
EFI-0041	Injection valve. Signal faulty1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only
EFI-0044	Ignition coil. Faulty signal1998	1998
EFI-0044	Ignition coil. Signal faulty1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only
EFI-0056	Fuel pressure sensor (high pressure). Faulty signal1998	1998
EFI-0056	Fuel pressure sensor (high pressure). Signal faulty1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only
EFI-0058	Abnormal intake air. Faulty signal1998	1998
EFI-0058	Intake air abnormal. Signal faulty1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only
EFI-0066	Brake vacuum sensor. Faulty signal1998	1998
EFI-0066	Brake vacuum sensor. Signal faulty1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only
EFI-0089	Fuel system. Faulty fuel pressure1998	1998
EFI-0089	Fuel system. Faulty fuel pressure1999–2001 · Engine B4184SM only	1999–2001 · Engine B4184SM only

All control modules for the Volvo S40 (1996–2004)