Information concerning B4184S and B4204S
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
From and including May 1997 there is only one replacement part engine control module (ECM) for each type of engine. These engine control modules (ECM) applies to both cars without, and for earlier cars, cars with pulsed secondary air injection system (PAIR) pump.
The engine control module (ECM) no longer controls the secondary air injection system (PAIR) pump when it is fitted to cars with manual transmission and pulsed secondary air injection system (PAIR) pump.
These cars however still meet the statutory requirement for emission levels.